diff --git a/src/main/java/org/java_websocket/WebSocketImpl.java b/src/main/java/org/java_websocket/WebSocketImpl.java
index 35e28d20e..32104afd1 100644
--- a/src/main/java/org/java_websocket/WebSocketImpl.java
+++ b/src/main/java/org/java_websocket/WebSocketImpl.java
@@ -716,7 +716,6 @@ public boolean isConnecting() {
 
 	@Override
 	public boolean isOpen() {
-		assert ( getReadyState() != READYSTATE.OPEN || !flushandclosestate );
 		return getReadyState() == READYSTATE.OPEN;
 	}