diff --git a/IDEHelper/Compiler/BfExprEvaluator.cpp b/IDEHelper/Compiler/BfExprEvaluator.cpp
index fe85f7cc..0958251e 100644
--- a/IDEHelper/Compiler/BfExprEvaluator.cpp
+++ b/IDEHelper/Compiler/BfExprEvaluator.cpp
@@ -10269,8 +10269,15 @@ void BfExprEvaluator::Visit(BfTypeOfExpression* typeOfExpr)
 		return;
 	}
 
-	mModule->AddDependency(type, mModule->mCurTypeInstance, BfDependencyMap::DependencyFlag_ExprTypeReference);
-	mResult = BfTypedValue(mModule->CreateTypeDataRef(type), typeType);
+	if (type->IsGenericParam())
+	{
+		mResult = BfTypedValue(mModule->mBfIRBuilder->GetUndefConstValue(mModule->mBfIRBuilder->MapType(typeType)), typeType);
+	}
+	else
+	{
+		mModule->AddDependency(type, mModule->mCurTypeInstance, BfDependencyMap::DependencyFlag_ExprTypeReference);
+		mResult = BfTypedValue(mModule->CreateTypeDataRef(type), typeType);
+	}
 }
 
 bool BfExprEvaluator::LookupTypeProp(BfTypeOfExpression* typeOfExpr, BfIdentifierNode* propName)