Index: sites/all/modules/contrib/userpoints_contrib/userpoints_role/userpoints_role.module
===================================================================
--- sites/all/modules/contrib/userpoints_contrib/userpoints_role/userpoints_role.module	(revision 307)
+++ sites/all/modules/contrib/userpoints_contrib/userpoints_role/userpoints_role.module	(working copy)
@@ -372,6 +372,6 @@
     }
   }
   // return the maximum role name
-  // max() returns the value of the largest key
-  return max($roles_within);
+  // max() returns the largest value in the array
+  return $roles_within[max(array_keys($roles_within))];
 }