First time someone reports this error, could you send your save to our email email@example.com please? It is located in the "D: \ Games \ KillerProject-V1.02.03-pc \ game \ saves" folder. Thank you.
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We only saw this happen once and it was a case of corrupted game / persistent data saving that was caused by the computer being under a very heavy processing load from other applications. Unfortunately the way to solve this problem is to start the game again(recommended) or load a save before that point (not recommended, as it is not possible to know at which point the data was corrupted). What platform are you playing on? windows or android?