diff --git a/src/main/java/com/cloudhopper/smpp/impl/DefaultSmppClient.java b/src/main/java/com/cloudhopper/smpp/impl/DefaultSmppClient.java
index c2850d4a..d19aa9fa 100644
--- a/src/main/java/com/cloudhopper/smpp/impl/DefaultSmppClient.java
+++ b/src/main/java/com/cloudhopper/smpp/impl/DefaultSmppClient.java
@@ -150,7 +150,9 @@ public void destroy() {
         // this.clientBootstrap.releaseExternalResources();
 
         try {
-            clientChannel.closeFuture().sync();
+            if (clientChannel != null) {
+                clientChannel.closeFuture().sync();
+            }
             this.clientBootstrap = null;
         } catch (InterruptedException e) {
             logger.warn("Thread interrupted closing client channel.", e);