'catch' expected - multiple catch blocks needed?

[Singing Boyo]

Using the latest g++, there appears to be a strange quirk in one of my try/catch blocks.

This refuses to compile:

void Method::run(ScopeContext* context){
	Variable** paramVars = new Variable*[nParms];
	ScopeContext* methodContext = new ScopeContext(context->getLevelObjectList(0));
	try{
		methodContext->incrementScope();
		MethodParamSet* paramVals= context->getMethodParams();
		for(int i=0; i<nParms; ++i){
			paramVars[i] = new Variable(parms[i].name, paramVals->parms[i]);
			methodContext->addObject(paramVars[i]);
		}
		if(context->getThisObject()!=0){
			Value* thisObj = context->getThisObject();
			if(thisObj->type.isClassInstance()){
				try{
					ClassInstance* inst = (ClassInstance*) thisObj->ptr;
					inst->enterScope(methodContext, PRIVATE);
				}catch(InvalidScopeSetup iss){}
			}
			Variable* var = new Variable("this",thisObj);
			try{
				methodContext->addObject(var);
			}catch(InvalidScopeSetup except){
				throw OperationException("Cannot use this as a parameter to a class-method.");
			}
		}
		ActionChain::run(methodContext);
	}catch(ReturnValue ret){
		if((ret.returned==0&&(!this->ret.isPrimitive()||this->ret.getValue().pType!=VOID))
			||(ret.returned!=0&&ret.returned->type!=this->ret)){
			throw OperationException("No value returned from a method returning a value, or wrong type returned. Occured " + getAtLineStr());
		}
		returned=ret.returned;
	}
	delete methodContext;
	for(int i=0; i<nParms; ++i){
		delete paramVars[i];
	}
	delete[] paramVars;
}

But if I add an extra catch block in (at the deepest indentation) there are no errors...

//Surrounding code of the catch block
if(context->getThisObject()!=0){
	Value* thisObj = context->getThisObject();
	if(thisObj->type.isClassInstance()){
		try{
			ClassInstance* inst = (ClassInstance*) thisObj->ptr;
			inst->enterScope(methodContext, PRIVATE);
		}catch(InvalidScopeSetup iss){
		
		}catch(InvalidScopeSetup iss){}//why do I need two?
	}
	Variable* var = new Variable("this",thisObj);
	try{
		methodContext->addObject(var);
	}catch(InvalidScopeSetup except){
		throw OperationException("Cannot use this as a parameter to a class-method.");
	}
}

Any insight? I would've expected the second to give an error, if anything, as I'm catching the same exception twice. I doubt it will affect how my code runs, but it struck me as very odd.