Index: branches/RC/core/units/general/helpers/search_helper.php
===================================================================
diff -u -N -r11412 -r11538
--- branches/RC/core/units/general/helpers/search_helper.php	(.../search_helper.php)	(revision 11412)
+++ branches/RC/core/units/general/helpers/search_helper.php	(.../search_helper.php)	(revision 11538)
@@ -210,6 +210,12 @@
 		 */
 		function getSearchClause(&$object, $field_name, $search_keyword, $custom_search)
 		{
+			if (array_key_exists($field_name, $object->VirtualFields) && !array_key_exists($field_name, $object->CalculatedFields)) {
+				// Virtual field, that is shown in grid, but it doesn't have corresponding calculated field.
+				// Happens, when field value is calculated on the fly (during grid display) and it is not searchable.
+				return '';
+			}
+
 			$search_keywords = $this->splitKeyword($search_keyword);
 
 			extract( $this->getFieldInformation($object, $field_name) ); // see getFieldInformation for more details