Fixed error handling if client is closed

server/util-server.js

@@ -416,11 +416,15 @@ exports.redisPingAsync = function (dsn) {
             url: dsn
         });
         client.on("error", (err) => {
-            if (client.isOpen) client.disconnect();
+            if (client.isOpen) {
+                client.disconnect();
+            }
             reject(err);
         });
         client.connect().then(() => {
-            if (client.isOpen) {
+            if (!client.isOpen) {
+                client.emit("error", new Error("connection isn't open"));
+            }
             client.ping().then((res, err) => {
                 if (client.isOpen) {
                     client.disconnect();
@@ -430,8 +434,7 @@ exports.redisPingAsync = function (dsn) {
                 } else {
                     resolve(res);
                 }
-                }).catch(error => reject);
+            }).catch(error => reject(error));
-            }
         });
     });
 };