ikkyu0319
diff --git a/‎providers/netty/src/main/java/org/asynchttpclient/providers/netty/NettyAsyncHttpProvider.java
Lines changed: 2 additions & 1 deletion b/‎providers/netty/src/main/java/org/asynchttpclient/providers/netty/NettyAsyncHttpProvider.java
Lines changed: 2 additions & 1 deletion
@@ -55,8 +55,9 @@ public NettyAsyncHttpProvider(AsyncHttpClientConfig config) {
 
     @Override
     public String toString() {
+        int availablePermits = channels.freeConnections != null ? channels.freeConnections.availablePermits() : 0;
         return String.format("NettyAsyncHttpProvider4:\n\t- maxConnections: %d\n\t- openChannels: %s\n\t- connectionPools: %s", config.getMaxTotalConnections()
-                - channels.freeConnections.availablePermits(), channels.openChannels.toString(), channels.connectionsPool.toString());
+                - availablePermits, channels.openChannels.toString(), channels.connectionsPool.toString());
     }
 
     @Override
Original file line number	Diff line number	Diff line change
`@@ -55,8 +55,9 @@ public NettyAsyncHttpProvider(AsyncHttpClientConfig config) {`
`55`	`55`
`56`	`56`	`@Override`
`57`	`57`	`public String toString() {`
	`58`	`+ int availablePermits = channels.freeConnections != null ? channels.freeConnections.availablePermits() : 0;`
`58`	`59`	`return String.format("NettyAsyncHttpProvider4:\n\t- maxConnections: %d\n\t- openChannels: %s\n\t- connectionPools: %s", config.getMaxTotalConnections()`
`59`		`- - channels.freeConnections.availablePermits(), channels.openChannels.toString(), channels.connectionsPool.toString());`
	`60`	`+ - availablePermits, channels.openChannels.toString(), channels.connectionsPool.toString());`
`60`	`61`	`}`
`61`	`62`
`62`	`63`	`@Override`