Fix NPE in BlockRewriter1_20_2 when block entity has null tag#1262
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Pull request overview
Fixes a null-pointer exception in the 1.20.2→1.20 block-entity rewrite path when a block entity is received with a null NBT tag (reported when placing a bed with a 1.18.2 client on a server originally running 1.20.4).
Changes:
- Add an early return in
handleBlockEntitywhenblockEntity.tag()isnullto prevent NPEs during tag rewrites.
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kennytv
approved these changes
May 19, 2026
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The error occurred when you placed a bed using the Minecraft 1.18.2 client on a server that was originally running version 1.20.4.