Index: trunk/core/kernel/db/db_tag_processor.php
===================================================================
diff -u -r2505 -r2581
--- trunk/core/kernel/db/db_tag_processor.php	(.../db_tag_processor.php)	(revision 2505)
+++ trunk/core/kernel/db/db_tag_processor.php	(.../db_tag_processor.php)	(revision 2581)
@@ -71,6 +71,11 @@
 		$block_params['name'] = $params['spearator_block'];
 		$separator = $this->Application->ParseBlock($block_params);
 		$filter_menu = $this->Application->getUnitOption($this->Prefix,'FilterMenu');
+		if(!$filter_menu)
+		{
+			trigger_error('<span class="debug_error">no filters defined</span> for prefix <b>'.$this->Prefix.'</b>, but <b>DrawFilterMenu</b> tag used', E_USER_WARNING);
+			return '';
+		}
 		
 		// Params: label, filter_action, filter_status
 		$block_params['name'] = $params['item_block'];
@@ -86,6 +91,7 @@
 			
 		$filters = Array();
 		$prefix_special = $this->getPrefixSpecial();
+		
 		foreach($filter_menu['Filters'] as $filter_key => $filter_params)
 		{
 			if(!$filter_params)