Index: plugin.php
===================================================================
--- plugin.php	(revision 28220)
+++ plugin.php	(working copy)
@@ -281,6 +281,8 @@
 		unset($GLOBALS['wp_filter'][$tag][$priority][$function_to_remove]);
 		if ( empty($GLOBALS['wp_filter'][$tag][$priority]) )
 			unset($GLOBALS['wp_filter'][$tag][$priority]);
+		if ( empty($GLOBALS['wp_filter'][$tag] ) )
+			unset($GLOBALS['wp_filter'][$tag]);
 		unset($GLOBALS['merged_filters'][$tag]);
 	}