--- a/server/rqlrewrite.py	Mon Mar 23 18:53:53 2009 +0100
+++ b/server/rqlrewrite.py	Wed Mar 25 10:40:22 2009 +0100
@@ -315,7 +315,7 @@
         return cmp_
 
     def visit_mathexpression(self, mexpr):
-        cmp_ = nodes.MathExpression(cmp.operator)
+        cmp_ = nodes.MathExpression(mexpr.operator)
         for c in cmp.children:
             cmp_.append(c.accept(self))
         return cmp_