Index: conditional_fields.module
===================================================================
--- conditional_fields.module	(revision 3888)
+++ conditional_fields.module	(working copy)
@@ -361,6 +361,10 @@
     if ($field['field_name'] == $form['field_name']['#value']) {
       continue;
     }
+    // - Exclude Node references: hook_allowed_values doesn't scale with a big number of nodes
+    if ($field['type'] == "nodereference") {
+     continue;
+    }
     // - Exclude fields already controlled by this one
     if (isset($controlled_fields[$field['field_name']])) {
       continue;