diff --git a/helpers/utils/b64.js b/helpers/utils/b64.js
index 8155c4fdf..51869b6d2 100644
--- a/helpers/utils/b64.js
+++ b/helpers/utils/b64.js
@@ -1,5 +1,5 @@
 export const decodeB64StringToArrayBuffer = (input) => {
-  const bytes = Math.floor((input / 4) * 3)
+  const bytes = Math.floor((input.length / 4) * 3)
   const ab = new ArrayBuffer(bytes)
   const uarray = new Uint8Array(ab)