Suikoden Tierkreis (E) Venom Problem!!!

Whenever i go though the volcano(the volcano which leads u to that tribe of those huge ppl), i walk though an exit then the screens goes black (BOTH!) but there is still sound. Is the rom corrupted?BTW: I'm using an R4 with YS MEnu.

https://www.romulation.org/forum/index.php?topic=1462.0