--- a/mcbot/cmds/xep.lua	Tue Apr 13 22:43:43 2010 +0200
+++ b/mcbot/cmds/xep.lua	Tue Apr 13 22:45:12 2010 +0200
@@ -33,7 +33,7 @@
 
 -- Logics comes from MattJ's riddim bot
 local function lookup_xep (xepnum)
-    xepnum = xepnum:gsub("[%s%?%.%!]+$", "")
+    if (xepnum) then xepnum = xepnum:gsub("[%s%?%.%!]+$", "") end
     -- Check that xepnum is a valid number
     xepnum = tonumber(xepnum)
     if not xepnum or xepnum <= 0 or xepnum > 9999 then return nil, "What XEP?" end