diff --git a/platform/common/vapi-background.js b/platform/common/vapi-background.js
index 1a550395382be..9cb8f901e0f19 100644
--- a/platform/common/vapi-background.js
+++ b/platform/common/vapi-background.js
@@ -1627,7 +1627,7 @@ vAPI.cloud = (( ) => {
         try {
             bin = await webext.storage.sync.get(keys);
         } catch (reason) {
-            return reason;
+            return String(reason);
         }
         let chunkCount = 0;
         for ( let i = 0; i < maxChunkCountPerItem; i += 16 ) {