[Bug]: Cannot assign field "forcedDrop" because "x" is null

[Jangtella]

Describe the bug you're experiencing

Dozens of identical error logs are being printed every second.

The player said that he reset stats, and items were automatically unequipped, and he re-allocated his stats and re-equipped his gear. Although I couldn't get further details as the player is no longer cooperating, I have found that the error begins when items are equipped and continues even after all items are unequipped. However, the error stops appearing once the player reconnects.

Given that the error does not persist after reconnecting even while wearing the items, it doesn't seem to be an issue with a specific item.

Below is the log:
[242월2026 04:25:20.427] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: java.lang.NullPointerException: Cannot assign field "forcedDrop" because "x" is null
[242월2026 04:25:20.428] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.uncommon.utilityclasses.PlayerUtils.lambda$forceDropItem$1(PlayerUtils.java:51)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.itemstack.StackData.edit(StackData.java:70)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.uncommon.utilityclasses.PlayerUtils.forceDropItem(PlayerUtils.java:51)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.uncommon.utilityclasses.PlayerUtils.forceUnequipItem(PlayerUtils.java:44)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.capability.player.data.JewelData.recalc(JewelData.java:70)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.capability.entity.EntityData.recalcStats_DONT_CALL(EntityData.java:617)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.event_hooks.my_events.CachedEntityStats.lambda$new$1(CachedEntityStats.java:55)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.capability.DirtySync.onTickTrySync(DirtySync.java:33)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.event_hooks.my_events.CachedEntityStats.onTick(CachedEntityStats.java:115)
[242월2026 04:25:20.429] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick.onTick(OnEntityTick.java:88)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/mmorpg@6.3.14/com.robertx22.mine_and_slash.mmorpg.event_registers.CommonEvents.lambda$register$12(CommonEvents.java:238)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.doCastFilter(EventBus.java:260)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.lambda$addListener$11(EventBus.java:252)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.post(EventBus.java:315)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at MC-BOOTSTRAP/net.minecraftforge.eventbus/net.minecraftforge.eventbus.EventBus.post(EventBus.java:296)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/forge@47.4.10/net.minecraftforge.common.ForgeHooks.onLivingTick(ForgeHooks.java:265)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.world.entity.LivingEntity.m_8119_(LivingEntity.java:2258)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.world.entity.player.Player.m_8119_(Player.java:241)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.level.ServerPlayer.m_9240_(ServerPlayer.java:467)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.network.ServerGamePacketListenerImpl.mixinextras$bridge$m_9240_$136(ServerGamePacketListenerImpl.java)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/neruina@2.1.2/com.bawnorton.neruina.handler.TickHandler.safelyTickPlayer(TickHandler.java:122)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.network.ServerGamePacketListenerImpl.wrapOperation$blm000$catchTickingPlayer$notTheCauseOfTickLag(ServerGamePacketListenerImpl.java:4300)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.network.ServerGamePacketListenerImpl.m_9933_(ServerGamePacketListenerImpl.java:262)
[242월2026 04:25:20.430] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.network.Connection.m_129483_(Connection.java:263)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.network.ServerConnectionListener.m_9721_(ServerConnectionListener.java:142)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.MinecraftServer.m_5703_(MinecraftServer.java:907)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.dedicated.DedicatedServer.m_5703_(DedicatedServer.java:283)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.MinecraftServer.m_5705_(MinecraftServer.java:814)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.MinecraftServer.m_130011_(MinecraftServer.java:661)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at TRANSFORMER/minecraft@1.20.1/net.minecraft.server.MinecraftServer.m_206580_(MinecraftServer.java:251)
[242월2026 04:25:20.431] [Server thread/INFO] [STDERR/]: [com.robertx22.mine_and_slash.event_hooks.my_events.OnEntityTick:onTick:93]: at java.base/java.lang.Thread.run(Thread.java:840)

Reproducability

.

Mod up to date

• Before submitting this issue I updated to the newest version and reproduced it

Tested Without Custom Mine and Slash Datapacks

• In case I used Mine and Slash datapacks, I ran Mine and Slash in a new instance without custom datapacks and confirmed the bug still exists

Mine and Slash version

1.20.1-6.3.14

Logs

.

[Jangtella]

I think the jewel slot matters.
If jewel get unequipped due to jewel slot point loss, the error starts popping up.

[RetsuOne]

1. Setup: Place the Minecraft 1.20.1 client JAR, the Mine and Slash mod JAR, and any necessary dependencies into a single directory.
2. Open: Launch Recaf and load the Mine and Slash JAR.
3. Locate: Navigate to com/robertx22/mine_and_slash/uncommon/utilityclasses/PlayerUtils.class.
4. Edit: Update the forceDropItem method by adding the null-safety checks (the if statements).
5. Compile: Press CTRL+S to recompile the class within Recaf. (green border on window = good)
6. Export: Go to File > Export program to save the modified JAR.
7. Test: Replace the original mod file on both the client and server, then run the game to verify the fix.
   Enjoy!"

[RetsuOne]

This error is caused by a missing null pointer protection in Mine and Slash 6.3.14. It triggers within the forceDrop method when the gem aura balance drops below zero.

More precisely, PlayerUtils.forceDropItem doesn't check for empty ItemStacks or valid Player entities before passing them to ExileStack for data modification.

The fix requires a manual class patch: deobfuscate PlayerUtils, apply the fix, and re-inject the modified class.