diff --git a/client/src/components/Datatypes/model.ts b/client/src/components/Datatypes/model.ts
index 45334ba8d25..28e55257daa 100644
--- a/client/src/components/Datatypes/model.ts
+++ b/client/src/components/Datatypes/model.ts
@@ -17,7 +17,8 @@ export class DatatypesMapperModel {
     isSubType(child: string, parent: string): boolean {
         const mapping = this.datatypesMapping;
         const childClassName = mapping.ext_to_class_name[child];
-        const parentClassName = mapping.ext_to_class_name[parent];
+        const parentClassName = mapping.ext_to_class_name[parent] || parent;
+
         if (!childClassName || !parentClassName) {
             return false;
         }