Would it be possible for you to compile in debug and get a crash log?
Also are you using TrinityCore 4.3.4? What revision?
What item is 4557 exactly? Is it used for this script?
It would seem that the crash is from removing the item.
However the function and it's usage is the same on 3.3.5a and 4.3.4, which is why the crash cant currently be solved without deeper inspection.
The crash is likely appearing before the actual crash of core. The action after crashing is just what triggers the crashed state.
I currently dont have client nor the core set up so I can not test at the moment.