Game crash at start on Linux... kind of

I'm using the latest Stellaris version 3.9.3, the latest version of ST:NC installed via Steam Workshop and it is my only active mod. When I start Stellaris on Windows with this mod, everything seems to work fine. But when on Linux, the game starts to load, then the Paradox Crash Reporter appears, and when I let this crash reporter window open (not doing anything with it), the game continues to load in the background. After some seconds, I can see the main menu and I can start a new game or load a savegame just fine. There aren't any problems with Stellaris when not using the ST:NC mod. When I have a look on Stellaris' error.log, I can see quite a few problems - but I'm not sure if they are responsible for this crash. Do you have any idea what causes it? Deleting and re-installing Stellaris or the mod doesn't change this behavior.

error.log:
[07:36:40][pdx_audio_util.cpp:168]: Could not find sound file 'music/concordium.ogg' in file: music/stnc_songs.asset line: 13
[07:36:40][pdx_audiomusic.cpp:176]: Music file too large, please keep tracks below 64mb (music/to_boldly_go.ogg)
[07:36:40][bitmapfont.cpp:3490]: Could not find coloring for character 'Y' (0x59)
[07:36:41][pdx_audiomusic.cpp:176]: Music file too large, please keep tracks below 64mb (music/the_final_frontier.ogg)
[07:36:41][virtualfilesystem_physfs.cpp:1202]: Could not open file: music/concordium.ogg, error: not found
[07:36:41][pdx_audiomusic_sdl.cpp:88]: For best performance and quality music files should be in 44.1kHz (concordium)
[07:36:43][pdxmeshtype.cpp:141]: Could not find mesh file gfx/models/ships/starfleet/farragut/tos/starfleet_farragut_tos.mesh for starfleet_starfleet_farragut_mid_2_mesh, switching to gfx/models/test_object.mesh
[07:36:43][pdxmeshtype.cpp:141]: Could not find mesh file gfx/models/ships/starfleet/miranda/nem/starfleet_miranda_nem.mesh for starfleet_starfleet_miranda_mid_7_mesh, switching to gfx/models/test_object.mesh
[07:36:44][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/argelian.dds"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "point_gun_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "point_gun_02"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "medium_gun_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "medium_gun_02"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "large_gun_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "large_gun_02"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_miranda_mid_7_entity" is missing required locator "hangar_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "point_gun_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "point_gun_02"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "medium_gun_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "medium_gun_02"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "large_gun_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "large_gun_02"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_miranda_mid_7_entity" is missing required locator "hangar_01"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "point_gun_01"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "point_gun_02"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "medium_gun_01"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "medium_gun_02"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "large_gun_01"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "large_gun_02"
[07:36:46][section.cpp:305]: ship section entity "terran_starfleet_miranda_mid_7_entity" is missing required locator "hangar_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_farragut_mid_2_entity" is missing required locator "small_gun_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_farragut_mid_2_entity" is missing required locator "large_gun_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_farragut_mid_2_entity" is missing required locator "large_gun_02"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_farragut_mid_2_entity" is missing required locator "large_gun_03"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_farragut_mid_2_entity" is missing required locator "torpedo_01"
[07:36:46][section.cpp:305]: ship section entity "master_starfleet_farragut_mid_2_entity" is missing required locator "torpedo_02"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_farragut_mid_2_entity" is missing required locator "small_gun_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_farragut_mid_2_entity" is missing required locator "large_gun_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_farragut_mid_2_entity" is missing required locator "large_gun_02"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_farragut_mid_2_entity" is missing required locator "large_gun_03"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_farragut_mid_2_entity" is missing required locator "torpedo_01"
[07:36:46][section.cpp:305]: ship section entity "borg_starfleet_farragut_mid_2_entity" is missing required locator "torpedo_02"
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "master_starfleet_miranda_mid_7_entity" is missing locator "point_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "master_starfleet_miranda_mid_7_entity" is missing locator "point_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "master_starfleet_miranda_mid_7_entity" is missing locator "medium_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "master_starfleet_miranda_mid_7_entity" is missing locator "medium_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "master_starfleet_miranda_mid_7_entity" is missing locator "large_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "master_starfleet_miranda_mid_7_entity" is missing locator "large_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "borg_starfleet_miranda_mid_7_entity" is missing locator "point_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "borg_starfleet_miranda_mid_7_entity" is missing locator "point_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "borg_starfleet_miranda_mid_7_entity" is missing locator "medium_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "borg_starfleet_miranda_mid_7_entity" is missing locator "medium_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "borg_starfleet_miranda_mid_7_entity" is missing locator "large_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "borg_starfleet_miranda_mid_7_entity" is missing locator "large_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "terran_starfleet_miranda_mid_7_entity" is missing locator "point_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "terran_starfleet_miranda_mid_7_entity" is missing locator "point_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "terran_starfleet_miranda_mid_7_entity" is missing locator "medium_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "terran_starfleet_miranda_mid_7_entity" is missing locator "medium_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "terran_starfleet_miranda_mid_7_entity" is missing locator "large_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_miranda_mid_7" with entity "terran_starfleet_miranda_mid_7_entity" is missing locator "large_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "master_starfleet_farragut_mid_2_entity" is missing locator "small_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "master_starfleet_farragut_mid_2_entity" is missing locator "large_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "master_starfleet_farragut_mid_2_entity" is missing locator "large_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "master_starfleet_farragut_mid_2_entity" is missing locator "large_gun_03".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "master_starfleet_farragut_mid_2_entity" is missing locator "torpedo_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "master_starfleet_farragut_mid_2_entity" is missing locator "torpedo_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "borg_starfleet_farragut_mid_2_entity" is missing locator "small_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "borg_starfleet_farragut_mid_2_entity" is missing locator "large_gun_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "borg_starfleet_farragut_mid_2_entity" is missing locator "large_gun_02".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "borg_starfleet_farragut_mid_2_entity" is missing locator "large_gun_03".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "borg_starfleet_farragut_mid_2_entity" is missing locator "torpedo_01".
[07:36:47][ship_design_templates.cpp:446]: Section template "starfleet_farragut_mid_2" with entity "borg_starfleet_farragut_mid_2_entity" is missing locator "torpedo_02".
[07:36:49][event.cpp:1106]: Event STNC_space_seed_event.131 is missing a sound
[07:36:49][event.cpp:1106]: Event STNC_exploration_events.2751 is missing a sound
[07:36:49][event.cpp:1106]: Event STNC_exploration_events.2857 is missing a sound
[07:36:49][event.cpp:1106]: Event STNC_exploration_events.1583 is missing a sound
[07:36:49][event.cpp:1106]: Event STNC_exploration_events.1930 is missing a sound
[07:36:49][event.cpp:1106]: Event STNC_exploration_events.1935 is missing a sound
[07:36:50][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/argelian.dds" file: common/solar_system_initializers/Alpha Systems/STNC_argelian.txt line: 68
[07:36:50][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/pakled.dds" file: prescripted_countries/STNC_01_alpha.txt line: 1160
[07:36:50][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/pakled.dds" file: prescripted_countries/STNC_01_alpha.txt line: 1160
[07:36:50][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/efrosian.dds" file: prescripted_countries/STNC_02_beta.txt line: 646
[07:36:50][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/efrosian.dds" file: prescripted_countries/STNC_02_beta.txt line: 646
[07:36:50][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/amaralan.dds" file: prescripted_countries/STNC_03_gamma.txt line: 41
[07:36:50][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/amaralan.dds" file: prescripted_countries/STNC_03_gamma.txt line: 41
[07:36:50][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/hazari.dds" file: prescripted_countries/STNC_04_delta.txt line: 512
[07:36:50][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/hazari.dds" file: prescripted_countries/STNC_04_delta.txt line: 512
[07:36:50][prescripted_systems.cpp:953]: There are no initializers with [usage = fallen_empire_init]. Game won't be able to generate fallen empires
[07:47:52][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/efrosian.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 1884669
[07:47:52][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/efrosian.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 1884669
[07:47:53][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/pakled.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2925361
[07:47:53][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/pakled.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2925361
[07:47:53][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/efrosian.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2927628
[07:47:53][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/efrosian.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2927628
[07:47:53][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/amaralan.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2929794
[07:47:53][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/amaralan.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2929794
[07:47:53][empire_flag.cpp:917]: could not find normal-sized texture "flags/trek/hazari.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2931935
[07:47:53][empire_flag.cpp:923]: could not find map-sized texture "flags/trek/map/hazari.dds" file: save games/empirestarnavysizearomulanstarempire_1902581372/2177.11.27.sav/gamestate line: 2931935
[07:47:54][gamestate.cpp:2533]: Repaired savegame, cleared 92 invalid deposits!
[07:47:54][tutorial_game_state_monitor.cpp:37]: Can't find building type for tutorial game state monitor