diff --git a/DrBotIRC.py b/DrBotIRC.py
index 2063ace..d75e0b3 100644
--- a/DrBotIRC.py
+++ b/DrBotIRC.py
@@ -205,7 +205,7 @@ class DrBotIRC(irclib.IRC):
     def xmlrpc_register_function(self, func, name):
         """Add a method to the XML-RPC interface."""
 
-        if func:
+        if func and self.xmlrpc:
             if hasattr(func, '__call__'):
                 self.xmlrpc.register_function(func, name)