diff --git a/src/lib/search/search.service.ts b/src/lib/search/search.service.ts
index ec37028..6358c80 100644
--- a/src/lib/search/search.service.ts
+++ b/src/lib/search/search.service.ts
@@ -18,7 +18,7 @@ export class SearchService<T extends IListable> {
     }
 
     searchIn(entities: T[]): T[] {
-        const searchValue = this.searchValue.toLowerCase();
+        const searchValue = this.searchValue?.toLowerCase();
         if (!searchValue || this.skip) {
             return entities;
         }