Merge pull request #26 from share/fix-close-already-closed-client

🐛 Fix double-close of a shared client

Author: alecgibson

index.js

@@ -103,6 +103,8 @@ var PUBLISH_SCRIPT =
   'end';
 
 function close(client) {
+  if (!client.isOpen) return Promise.resolve();
+
   if (client.close) {
     return client.close();
   }