diff --git a/fe_calckey/frontend/magnetar-common/src/be-api.ts b/fe_calckey/frontend/magnetar-common/src/be-api.ts
index 2235410..446a69c 100644
--- a/fe_calckey/frontend/magnetar-common/src/be-api.ts
+++ b/fe_calckey/frontend/magnetar-common/src/be-api.ts
@@ -36,10 +36,9 @@ function nestedUrlSearchParams(data: any, topLevel: boolean = true): string {
                     .map(encodeURIComponent)
                     .join("&");
 
-            const inner = Object.entries(data).map(([k, v]) => [
-                k,
-                nestedUrlSearchParams(v, false),
-            ]);
+            const inner = Object.entries(data)
+                .filter(([_, v]) => typeof v !== "undefined")
+                .map(([k, v]) => [k, nestedUrlSearchParams(v, false)]);
 
             return new URLSearchParams(inner).toString();