Using ReplayMod replaymod-1.15.2-2.2.0-b7-43-g065d713 we have seen game crashes when rendering. Attached are example crash reports.

crash-2020-04-02_12.20.57-client.txt
crash-2020-04-02_12.04.39-client.txt
crash-2020-04-02_11.47.55-client.txt
crash-2020-04-02_11.38.50-client.txt

Some testers are reporting no crash logs are created. The above reports are from the same user.

I've tested this a bit more and it seems to be related to Optifine. If you remove the optifine and optifabric mods from the mods folder and restart MC. The render from ReplayMod works fine. Sometimes with Optifine installed, during rendering the application hangs and doesn't generate a log file.

I realise the mod hasn't been tested with Optifine yet, but I thought it was worth reporting.