Just downloaded v2.30.0 for the virtual property compound assignment, and it's mostly great but there does seem to be an issue. Here's a snippet of the registration:

ASengine->RegisterObjectType("jjOBJ", sizeof(Omonster), asOBJ_REF | asOBJ_NOCOUNT );
ASengine->RegisterObjectMethod("jjOBJ", "uint16 get_creatorID() const", asFUNCTION(getCreatorID), asCALL_CDECL_OBJFIRST);
ASengine->RegisterObjectMethod("jjOBJ", "uint16 set_creatorID(uint16)", asFUNCTION(setCreatorID), asCALL_CDECL_OBJFIRST);
ASengine->RegisterGlobalFunction("jjOBJ @get_jjObjects(int)", asFUNCTION(getObject), asCALL_CDECL);

Given that, any of these run fine:

    jjObjects[0].creatorID = jjObjects[0].creatorID + 2;
//or
    jjOBJ@ obj = jjObjects[0];
    obj.creatorID = obj.creatorID + 2;
//or
    jjOBJ@ obj = jjObjects[0];
    obj.creatorID += 2;

But either of these versions produce a Null Pointer Access exception:

    jjObjects[0].creatorID += 2;
//or
    get_jjObjects(0).creatorID += 2;

The problem seems to exist for any function that returns a handle, even ones that aren't registered as get_*; that was just the easiest one to test given my existing registration. If creatorID is registered with RegisterObjectProperty instead, nothing goes wrong.

Thanks for the report. I'll look into it.

I've fixed this bug in revision 2137.