Index: trunk/kernel/units/themes/themes_tag_processor.php
===================================================================
diff -u -r2600 -r3834
--- trunk/kernel/units/themes/themes_tag_processor.php	(.../themes_tag_processor.php)	(revision 2600)
+++ trunk/kernel/units/themes/themes_tag_processor.php	(.../themes_tag_processor.php)	(revision 3834)
@@ -5,7 +5,11 @@
 		function StylesheetFile($params)
 		{
 			$object =& $this->Application->recallObject( $this->getPrefixSpecial(), $this->Prefix, $params );
-
+			if (!$object->GetDBField('StyleName')) {
+				// no stylesheet is associated with current theme
+				return '';
+			}
+			
 			$css_url = $this->Application->BaseURL('/kernel/stylesheets');
 			$css_path = rtrim( str_replace( $this->Application->BaseURL(), FULL_PATH.'/', $css_url), '/' );