Index: units/categories/categories_tag_processor.php
===================================================================
--- units/categories/categories_tag_processor.php	(revision 15390)
+++ units/categories/categories_tag_processor.php	(working copy)
@@ -958,7 +958,7 @@
 		}
 
 		// 1. try to get already cached suggestion
-		$cache_key = 'search.suggestion[%SpellingDictionary%]:' . $keywords;
+		$cache_key = 'search.suggestion[%SpellingDictionarySerial%]:' . $keywords;
 		$suggestion = $this->Application->getCache($cache_key);
 
 		if ( $suggestion !== false ) {