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On steam deck i have it that when i start the game from the launcher it crashes
Please stop posting this in every thread that mentions a crash. You've already started a thread (https://forum.paradoxplaza.com/forum/threads/steam-deck-crash-ck3.1730370/) and AndrewT has replied and explained that the game isn't technically supported on Steam Deck so please keep to that thread.

For the issue at hand you've clearly got mods installed as the debug shows several:

Always Flat Map|mod/ugc_2216782330.mod
Valyrian Steel|mod/ugc_2962713441.mod
Better Map Graphics|mod/ugc_3051778961.mod
COW-AGOT: 3D Models & Bigger Castles|mod/ugc_2971198450.mod
AGOT: Minor House Flavour Fix|mod/ugc_3328065634.mod
Simple Graphic Pack|mod/ugc_3255992492.mod
A Game of Thrones|mod/ugc_2962333032.mod
Better Map Graphics Temporary Fix|mod/ugc_3338498817.mod
AGOT: Canon Children+|mod/ugc_2966438738.mod
AGOT: Minor House Flavour|mod/ugc_2977547390.mod
AGOT: More Actions|mod/ugc_3059021049.mod
AGOT: Ruins of Westeros|mod/ugc_3434291953.mod
AGOT Submod Core|mod/ugc_3034473189.mod
AGOT - Armies of Westeros|mod/ugc_2966543745.mod
DaddyPika's Graphical Map Overhaul|mod/ugc_2228230595.mod

If these are the root cause or not I can't say as the error log is a bit all over the place but I'd start by disabling them and see if that makes a difference. If you could also upload the save that'd be great as I can then test it.
 
Sorry if im placing it in to much threads i bought the deck this week just to play with mods so when i got this its a little bit like oh shit here goes my money for nothing.

I will try with disabling them when i get home and how can i find the save?
My reply wasn't for you, it was the original poster ;). In your case there's nothing we can do since we don't test the game on Steam Deck meaning we don't really support it either.