Does lua garbage collect upon an error?

I have a C++ program which uses lua. C++ exposes a reference counted datatype as userdata with an assigned finalizer so that lua can take ownership of such values.

This works fine. However one thing worries me: if there was to occur an error executing a script where lua holds instances of that datatype, will the finalizer be called then?

Another formulation of the question would be: Does lua run a garbage collecti开发者_运维问答on cycle upon an error?

Yes, everything continues to run fine if the error occurs inside a protected call. If Lua panics, then the Lua state is not in a usable condition.