Solved Random numbers in chat for a single player

Someone in my server keeps getting random numbers in chat:



Here's my plugins:
- CoreProtect
- Essentials 2
- EssentialsChat 2
- EssentialsProtect 2
- EssentialsSpawn 2
- CustomDurability
- EasyClans
- StackSize
- Multiverse Core
- PermissionsEx
- Phatloots
- ProtocolLib
- SimpleRename
- Superbvote
- TAB
- Tim
- Vault
- dynmap
- findIp
- nuvotifier
- worldedit
- worldguard

He says it sometimes happens when he mines coal

EDIT: When he mines in general
EDIT2: Nvm it's customdurability