here is the report https://pastebin.com/3xbsASvL i just had replay mod, optifine and forge installed on the multimc launcher

This is due to an incompatibility with the specific Optifine version you're using: https://www.replaymod.com/forum/thread/2118
Please use the forum for bug reporting, response time tends to be significantly shorter over there.

@CrushedPixel will/can this be fixed in the next version of replay mod/optifine?

If you had read the thread I linked, you'd know that it works fine with Optifine C9.