NullPointer Fix for Mio
by Mioki_
NullPointer Fix for Mio is a Forge and NeoForge technology mod that patches missing-value handling in Minecraft network packets.
What it does
The mod changes how certain network packets are read and written so that a missing value no longer crashes the game. When a packet write receives an empty value, the mod substitutes an empty replacement instead, which keeps the connection running. Servers that run it need every player to install it too. Builds cover 1.19.2 – 1.21.11 for Forge and NeoForge, released under the MIT License.
Key features
Safer packet reading
Core read methods for network packets are modified so that malformed data is handled without a crash.
Missing values replaced with empties
When a packet write receives a missing value, an empty replacement takes its place, so the write completes.
Tag errors surface cleanly
The compound tag returned in this stage makes later NBT calls such as getString or getInt throw a pointer exception instead of failing silently.
Compatibility
Latest build for each game version and loader.
1.21.x12 of 12 versions with builds
1.20.x6 of 6 versions with builds
1.19.x3 of 3 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Questions
Does NullPointer Fix for Mio need to be installed on both sides?
Which loaders does NullPointer Fix for Mio support?
In the catalog
NullPointer Fix for Mio is one of 8,499 Technology mods on ModsFinder, and one of 4,122 Technology mods for Forge. 19,862 mods support Minecraft 1.21.11.
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What the author says
This mod safely modifies the core read method of Minecraft network packets. Whenever any mod attempts to write null into a packet, the method automatically replaces null with an empty CompoundTag at the return stage, ensuring that any subsequent NBT operations (such as getString, getInt, etc.) will not throw a null…
Official listing
- Modrinth page
- modrinth.com/mod/nullpointer-fix-for-mio
- Owner
- Mioki_
- Published
- 2026-06-12
- Updated on Modrinth
- 2026-06-12
- Facts verified
- 2026-10-15