diff --git a/packages/core/data-transfer/src/engine/validation/schemas/index.ts b/packages/core/data-transfer/src/engine/validation/schemas/index.ts
index 134104c928..5dc2c1994f 100644
--- a/packages/core/data-transfer/src/engine/validation/schemas/index.ts
+++ b/packages/core/data-transfer/src/engine/validation/schemas/index.ts
@@ -28,6 +28,7 @@ const isOptionalAdminType = (diff: Diff) => {
     const name = (diff?.values[0] as Schema)?.info?.singularName;
     return (OPTIONAL_CONTENT_TYPES as ReadonlyArray<string | undefined>).includes(name);
   }
+  return false;
 };
 
 const isIgnorableStrict = (diff: Diff) => isAttributeIgnorable(diff) || isOptionalAdminType(diff);