diff --git a/dotnetcoresignalrclientjava/src/main/java/com/smartarmenia/dotnetcoresignalrclientjava/WebSocketHubConnectionP2.java b/dotnetcoresignalrclientjava/src/main/java/com/smartarmenia/dotnetcoresignalrclientjava/WebSocketHubConnectionP2.java
index 9389a08..404bfa2 100644
--- a/dotnetcoresignalrclientjava/src/main/java/com/smartarmenia/dotnetcoresignalrclientjava/WebSocketHubConnectionP2.java
+++ b/dotnetcoresignalrclientjava/src/main/java/com/smartarmenia/dotnetcoresignalrclientjava/WebSocketHubConnectionP2.java
@@ -199,7 +199,7 @@ public void run() {
 
     @Override
     public synchronized boolean isConnected() {
-        return client.isOpen();
+        return client != null && client.isOpen();
     }
 
     @Override