Index: trunk/kernel/units/categories/categories_tag_processor.php
===================================================================
diff -u -r2613 -r3554
--- trunk/kernel/units/categories/categories_tag_processor.php	(.../categories_tag_processor.php)	(revision 2613)
+++ trunk/kernel/units/categories/categories_tag_processor.php	(.../categories_tag_processor.php)	(revision 3554)
@@ -182,7 +182,7 @@
 		// 'p_id'=>'0',  ?? 
 		$params = array_merge(array('pass'=>'m'), $params);
 		$cat_id = getArrayValue($params,'cat_id');
-		if (!$cat_id) {
+		if ($cat_id === false) {
 //			$cat_id = $this->Application->Parser->GetParam('cat_id');
 			$cat_id = $this->Application->GetVar($this->Prefix.'_id');
 		}