diff --git a/security_monkey/auditors/gcp/gce/firewall.py b/security_monkey/auditors/gcp/gce/firewall.py
index fe0b49b4d..5246f0530 100644
--- a/security_monkey/auditors/gcp/gce/firewall.py
+++ b/security_monkey/auditors/gcp/gce/firewall.py
@@ -47,6 +47,9 @@ def _port_range_exists(self, allowed_list, error_cat='ALLOWED'):
         Check to see if a port range exists in the allowed field.
         """
         errors = []
+        if allowed_list == None:
+            allowed_list = []
+
         for allowed in allowed_list:
             ports = allowed.get('ports', None)
             if ports: