Nice to see someone from Poland. I'll write here in English for now. Maybe others will find it interesting and helpful.

I've checked your save. Hmm... "checked" it's not the best word cause the game freezes a second after I hit "end turn" (system stops to respond too).
What I've found: There are many totally empty crusade stacks all around the map. Right-clicking of one of them give you an error message which you can skip by hitting enter but it can give a CTD too. The game freezes during Turkish turn and I've found that Turks have 2 Ilkhanate's empty crusades in their provinces. Additional 3 empty Russian crusades waits in Georgia. Resolving a battle with such a crusade can surely cause CTD.
Solution: I doubt there is any solution for your ongoing campaign. Quick solution for any new campaign will be probably disabling the crusades for all factions in unit_prod file. If you don't know how to do it I can make it for you.

I'll try to fix the crusade issue but I can't promise you this. btw It reminds me a somewhat similar problem in early Pike & Musket mod version (revolting armies full of spies and emissaries ).