Base information

• Minecraft version:1.12.2
• Mod version:2.3.27
• Minecraft Forge version:Forge 14.23.5.2855 Optifine OptiFine_1.12.2_HD_U_G5
• Mod Pack: (if applicable)

Crash report

EventsRainCurse.java.txt

crash-2021-07-13_23.57.20-client.txt
The decompiled java seems to point to a wrong line, the source file will help nevertheless.

Ok, so Entity::getEntityWorld will not return null even in these cases, right? The comment of forge said so.

I'm not sure what comment your referring to but getEntityWorld just returns the world and at the point that event is called (Entity construction) the world can be null.

Some player provided me with this, yet I can not find why it crashed at there. Idealland is not an open-source mod yet, but if you need it's full code, I can provide it.

related_mod.zip
This is the jar file of Idealland he used. Zipped as Github doesnot allow direct jar upload.

Line 64 of the class you posted.

Entities can have null worlds when used for pure rendering related things.