diff --git a/resources/lib/websocket/_core.py b/resources/lib/websocket/_core.py
index 1ff80f05..7934cc15 100644
--- a/resources/lib/websocket/_core.py
+++ b/resources/lib/websocket/_core.py
@@ -197,7 +197,10 @@ class WebSocket(object):
             return None
 
     def is_ssl(self):
-        return isinstance(self.sock, ssl.SSLSocket)
+        try:
+            return isinstance(self.sock, ssl.SSLSocket)
+        except:
+            return False
 
     headers = property(getheaders)