diff --git a/ui-ngx/src/app/shared/components/string-items-list.component.ts b/ui-ngx/src/app/shared/components/string-items-list.component.ts
index fe9c2746c3..6d0c57ab0a 100644
--- a/ui-ngx/src/app/shared/components/string-items-list.component.ts
+++ b/ui-ngx/src/app/shared/components/string-items-list.component.ts
@@ -208,7 +208,7 @@ export class StringItemsListComponent implements ControlValueAccessor, OnInit {
   }
 
   onOptionSelected(event: MatAutocompleteSelectedEvent): void {
-    if (event.option.value) {
+    if (event.option.value != null) {
       this.add(event.option.value);
     } else {
       this.clear();