diff --git a/sublist3r.py b/sublist3r.py
index 52c8ecf..1efdf0e 100755
--- a/sublist3r.py
+++ b/sublist3r.py
@@ -296,7 +296,7 @@ class GoogleEnum(enumratorBaseThreaded):
         return links_list
 
     def check_response_errors(self, resp):
-        if 'Our systems have detected unusual traffic' in resp:
+        if isinstance(resp, basestring) and 'Our systems have detected unusual traffic' in resp:
             self.print_(R + "[!] Error: Google probably now is blocking our requests" + W)
             self.print_(R + "[~] Finished now the Google Enumeration ..." + W)
             return False