add try-catch block

lib/tasks/enqueue.js

@@ -79,12 +79,14 @@ class TaskEnqueue extends Task {
     this.notifyUrl = url;
 
     /* invoke account-level webhook for queue event notifications */
-    cs.performQueueWebhook({
-      event: 'join',
-      queue: this.data.name,
-      length: members,
-      joinTime: this.waitStartTime
-    });
+    try {
+      cs.performQueueWebhook({
+        event: 'join',
+        queue: this.data.name,
+        length: members,
+        joinTime: this.waitStartTime
+      });
+    } catch (err) {}
   }
 
   async _removeFromQueue(cs) {