Index: servefile-0.5.4/servefile/servefile.py
===================================================================
--- servefile-0.5.4.orig/servefile/servefile.py
+++ servefile-0.5.4/servefile/servefile.py
@@ -890,7 +890,7 @@ class ServeFile():
                 ips = [ip for ip in ips if ':' in ip]
 
             return ips
-        return None
+        return []
 
     def setSSLKeys(self, cert, key):
         """ Set SSL cert/key. Can be either path to file or pyopenssl X509/PKey object. """