Delta emulator crashing game

Hey guys. I know this is kind of a small community but if anyone has any thoughts that would be super appreciated.

I got LIB2 on Delta emulator. On day 31 now. I’ve just recently encountered a bug (?) where I can’t leave the cave if I’m going together with my partner (Jack). Once I exit the cave, both top and bottom screens on the emulator go black. Sometimes I can still hear the audio, which means the game is still going but it just doesn’t show? I don’t have this problem if I separate from my partner and leave the cave alone, though.

Has anyone encountered this problem before? Thanks in advance!