Internal Server Error (When picking up an Item from the ground)

[ChicoTerry2]

Hi Everyone! I started a server with SpongeForge 1.12.2 (at the beginning without mods) and everything worked fine, but then i added my mods, and everything was perfect, until I found an item on the ground, I tried to pick it up but the server said: "You were kicked from the server XXXXXX: Internal Server Error" and the server shut down,

This is the Console Log from my Minehut server just after i picked the item:

Quote

[18:26:22] [Server thread/WARN] [minecraft/NetworkSystem]: Failed to handle packet for /XX.XXX.XX.XXX:XXXXX
net.minecraft.util.ReportedException: Adding item to inventory
    at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:459) ~[oq.class:?]
    at net.minecraft.network.NetHandlerPlayServer.redirect$zin000$impl$onPlayerTick(NetHandlerPlayServer.java:2504) ~[pa.class:?]
    at net.minecraft.network.NetHandlerPlayServer.func_73660_a(NetHandlerPlayServer.java:173) ~[pa.class:?]
    at net.minecraftforge.fml.common.network.handshake.NetworkDispatcher$1.func_73660_a(NetworkDispatcher.java:209) ~[NetworkDispatcher$1.class:?]
    at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:285) ~[gw.class:?]
    at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:180) [oz.class:?]
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:790) [MinecraftServer.class:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:397) [nz.class:?]
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668) [MinecraftServer.class:?]
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526) [MinecraftServer.class:?]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_312]
Caused by: java.lang.NullPointerException
    at net.minecraft.entity.player.InventoryPlayer.impl$getSpongeSlotByIndex(InventoryPlayer.java:2126) ~[aec.class:?]
    at net.minecraft.entity.player.InventoryPlayer.redirect$zhc000$impl$ifCaptureDoTransactions(InventoryPlayer.java:2145) ~[aec.class:?]
    at net.minecraft.entity.player.InventoryPlayer.func_70452_e(InventoryPlayer.java:284) ~[aec.class:?]
    at net.minecraft.entity.player.InventoryPlayer.func_191971_c(InventoryPlayer.java:425) ~[aec.class:?]
    at net.minecraft.entity.player.InventoryPlayer.func_70441_a(InventoryPlayer.java:378) ~[aec.class:?]
    at net.minecraft.entity.item.EntityItem.redirect$zfm000$spongeImpl$throwPikcupEventForAddItem(EntityItem.java:1290) ~[acl.class:?]
    at net.minecraft.entity.item.EntityItem.func_70100_b_(EntityItem.java:400) ~[acl.class:?]
    at net.minecraft.entity.player.EntityPlayer.redirect$zha000$onPlayerCollideEntity(EntityPlayer.java:4885) ~[aed.class:?]
    at net.minecraft.entity.player.EntityPlayer.func_71044_o(EntityPlayer.java:600) ~[aed.class:?]
    at net.minecraft.entity.player.EntityPlayer.func_70636_d(EntityPlayer.java:571) ~[aed.class:?]
    at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2179) ~[vp.class:?]
    at net.minecraft.entity.player.EntityPlayer.func_70071_h_(EntityPlayer.java:234) ~[aed.class:?]
    at net.minecraft.entity.player.EntityPlayerMP.func_71127_g(EntityPlayerMP.java:382) ~[oq.class:?]
    ... 10 more
[18:26:22] [Server thread/INFO] [minecraft/NetHandlerPlayServer]: XXXXXXXXX lost connection: Internal server error
[18:26:22] [Server thread/INFO] [minecraft/DedicatedServer]: XXXXXXXX left the game