diff --git a/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/AdvancedSearch/AdvancedSearchController.js b/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/AdvancedSearch/AdvancedSearchController.js
index 1f8e4d417607903935948d33723a29df2e421dc6..a37fcaa32687baf19c5cf119c9a3c70d33ee1d21 100644
--- a/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/AdvancedSearch/AdvancedSearchController.js
+++ b/openbis_standard_technologies/dist/core-plugins/eln-lims/1/as/webapps/eln-lims/html/js/views/AdvancedSearch/AdvancedSearchController.js
@@ -32,7 +32,7 @@ function AdvancedSearchController(mainController, forceSearch) {
 		for(ruleKey in criteria.rules) {
 			var rule = criteria.rules[ruleKey];
 			numberOfRules++;
-			if(!rule.value || rule.value.trim() === "*") {
+			if(rule.value === null || rule.value === undefined || ("" + rule.value).trim() === "" || ("" + rule.value).trim() === "*") {
 				numberOfGeneralRules++;
 			}
 		}