diff --git a/src/groups.js b/src/groups.js
index e958b4d9f..e79d074ae 100644
--- a/src/groups.js
+++ b/src/groups.js
@@ -162,7 +162,7 @@ async function setMembership(userId, groupIds) {
     });
 
     const [error] = await safe(database.transaction(queries));
-    if (error && error.code === 'ER_NO_REFERENCED_ROW_2') throw new BoxError(BoxError.NOT_FOUND, error.message);
+    if (error && error.code === 'ER_NO_REFERENCED_ROW_2') throw new BoxError(BoxError.NOT_FOUND, 'Group not found');
     if (error && error.code === 'ER_DUP_ENTRY') throw new BoxError(BoxError.CONFLICT, 'Already member');
     if (error) throw error;
 }