diff --git a/src/api/api.service.ts b/src/api/api.service.ts
index 040c0c4..b779140 100644
--- a/src/api/api.service.ts
+++ b/src/api/api.service.ts
@@ -52,7 +52,7 @@ export default abstract class ApiService {
   }
 
   private static combineUrls(...parts: string[]): string {
-    return parts.map(part => part.replace(/(^\/+|\/+$)/g, '')).join('/');
+    return parts.map(part => (!part || part == '' ? '/' : part).replace(/(^\/+|\/+$)/g, '')).join('/');
   }
 
   protected combinedUrl(request: RequestData) {