diff --git a/utils/helper.ts b/utils/helper.ts
index f3a1025a..366948ab 100644
--- a/utils/helper.ts
+++ b/utils/helper.ts
@@ -204,5 +204,5 @@ export function convertBigNumberToString(x: any) {
 			x += new Array(e + 1).join('0')
 		}
 	}
-	return x
+	return x.toString()
 }