Don't know how to fix this, driving me nuts on my server. I have a pretty simple server with 100 plugins. When I drag random items from my inventory to backpack or from backpack back to my inventory or box to my inventory I get this error, once it happened on leather, now it happened on timed explosives.

I reload the stack plugin, loot plugin, restart server, still error persists and I get kicked immediately when this error occurs.

AssertionException: Assertion failure.
Value was False Expected:
True split_Amount <= 0