? conditional_fields_zero_value_fix.patch
Index: conditional_fields.module
===================================================================
RCS file: /cvs/drupal/contributions/modules/conditional_fields/conditional_fields.module,v
retrieving revision 1.6
diff -u -p -r1.6 conditional_fields.module
--- conditional_fields.module	6 Dec 2008 16:54:30 -0000	1.6
+++ conditional_fields.module	11 May 2009 02:19:55 -0000
@@ -637,7 +637,7 @@ function conditional_fields_find_require
 function conditional_fields_is_triggered($selected_values, $trigger_values) {
   foreach ((array)$selected_values as $values) {
     foreach ((array)$values as $value) {
-      if ($value && in_array($value, $trigger_values)) {
+      if (isset($value) && in_array($value, $trigger_values)) {
         return TRUE;
       }
     }