Index: css_injector.module
===================================================================
--- css_injector.module	(revision 142)
+++ css_injector.module	(working copy)
@@ -31,6 +31,8 @@
  * based on rules configured by the site administrator.
  */
 function css_injector_init() {
+  $path = drupal_get_normal_path($_GET['q']);
+  if (!drupal_match_path($path, 'admin/build/*')) init_theme();
   $css_rules = _css_injector_load_rule();
   foreach ($css_rules as $css_rule) {
     if (_css_injector_evaluate_rule($css_rule)) {