diff --git a/src/common/fetchClient.ts b/src/common/fetchClient.ts
index d340b97..1d9a26b 100644
--- a/src/common/fetchClient.ts
+++ b/src/common/fetchClient.ts
@@ -97,6 +97,9 @@ export default class FetchClient {
     function appendParams(key: string, value: any, parentKey?: string) {
       const fullKey = parentKey ? `${parentKey}[${key}]` : key;
 
+      // Skip undefined values
+      if (value === undefined) return;
+
       if (
         typeof value === "object" &&
         value !== null &&