diff --git a/internal/util/typeutil/schema.go b/internal/util/typeutil/schema.go
index e2dfb5a4fe..a2822bdd63 100644
--- a/internal/util/typeutil/schema.go
+++ b/internal/util/typeutil/schema.go
@@ -97,7 +97,7 @@ func CreateSchemaHelper(schema *schemapb.CollectionSchema) (*SchemaHelper, error
 // GetPrimaryKeyField returns the schema of the primary key
 func (helper *SchemaHelper) GetPrimaryKeyField() (*schemapb.FieldSchema, error) {
 	if helper.primaryKeyOffset == -1 {
-		return nil, fmt.Errorf("no primary in schema")
+		return nil, fmt.Errorf("Failed to get primary key field: no primary in schema")
 	}
 	return helper.schema.Fields[helper.primaryKeyOffset], nil
 }