Packaged project crashes on exit

Hello, I get a crash every time on exit the game. (I uses “Exit Game” blueprint node)link text

I don’t know but something wrong with this check

            FORCEINLINE bool IsCanaryOk() const
		return Canary == FFreeBlock::CANARY_VALUE;

And this function always returns false value;
canary == 0x0 != 0xe3

Is it an engine bug?

I spent 15 hours, but solved this problem. The reason was one of the Substance textures. I don’t know why it crashes, the texture is displayed correctly in engine viewport and in packaged project with no information in log.