TFT crashes in EVERY loading screen

Hey guys! my game is getting a critical error everytime i load into a game. I only play TFT but it also crashes in LOL. I wanted to spectate a friends game and then decided otherwise and closed the game with alt+f4. 3 days later when starting the client i could decide reconnect or quit. I chose reconnect (how stupid i was) and got a black screen (which makes sense because the client maybe thought the game was still going but it was over since 3 days). Since then i cannot load into a game without a critical error... I tried the following: 1. Reinstall the game + deleting every riot/league folder 2. Used the repair function of the client 3. Use another account I hope someone can solve the problem!
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