diff --git a/index.js b/index.js
index 731fbab2f25f832a076d4d7dc019848c555f3acc..aaa740893915f538f570c76e39afbc30eb6869dd 100644
--- a/index.js
+++ b/index.js
@@ -179,7 +179,7 @@ FCM.on = (event, callback) => {
       try {
         await callback(data);
       } catch (err) {
-        console.error('Notification handler err', err);
+        console.error('Notification handler err:\n'+err.stack);
         throw err;
       }
       if (!data._finishCalled) {