--- a/services/sync/modules/engines.js
+++ b/services/sync/modules/engines.js
@@ -599,17 +599,16 @@ EngineManager.prototype = {
         this._engines[name] = engine;
       }
     } catch (ex) {
       let name = engineObject || "";
       name = name.prototype || "";
       name = name.name || "";
 
       this._log.error(`Could not initialize engine ${name}`, ex);
-      return engineObject;
     }
   },
 
   unregister(val) {
     let name = val;
     if (val instanceof Engine) {
       name = val.name;
     }