# TypeError: Cannot read property 'key' of undefined

**URL:** <https://discuss.elastic.co/t/typeerror-cannot-read-property-key-of-undefined/246461>\
**Category:** Kibana\
**Created:** [August 26, 2020, 2:03pm UTC](https://discuss.elastic.co/t/typeerror-cannot-read-property-key-of-undefined/246461 "2020-08-26T14:03:56Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![balajiduddu](https://avatars.discourse-cdn.com/v4/letter/b/77aa72/32.png) [@balajiduddu](https://discuss.elastic.co/u/balajiduddu)\
**Post date:** [August 26, 2020, 2:03pm UTC](https://discuss.elastic.co/t/typeerror-cannot-read-property-key-of-undefined/246461/1 "2020-08-26T14:03:57Z")

</div>

HI ,  
I am new to kibana and in our project we are using kibana of version 6.2.3 while launching kibana dashboard there we are getting error at the top of the page

 ![image](https://us1.discourse-cdn.com/elastic/original/3X/a/d/ad23b9d3794ed8220270846af301fd33d89cf0d0.jpeg)  
and in developer page could see the below error  
Promise: Detected an unhandled Promise rejection.  
TypeError: Cannot read property 'key' of undefined  
commons.bundle.js?v=16602:51 Uncaught (in promise) TypeError: Cannot read property 'key' of undefined  
at commons.bundle.js?v=16602:51  
at Array.forEach ()  
at Buckets.AggResponseBucketsProvider.Buckets.forEach (commons.bundle.js?v=16602:51)  
at collectBucket (commons.bundle.js?v=16602:21)  
at Object.tabifyAggResponse (commons.bundle.js?v=16602:21)  
at commons.bundle.js?v=16602:1  
at Notifier.logger [as event] (commons.bundle.js?v=16602:1)  
at Notifier.wrapper [as event] (vendors.bundle.js?v=16602:88)  
at Object.tabify (commons.bundle.js?v=16602:1)  
at commons.bundle.js?v=16602:21  
at new Promise ()  
at handler (commons.bundle.js?v=16602:21)  
at commons.bundle.js?v=16602:51

---

<div class="post-metadata">

**Author:** ![Aaron\_Caldwell](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/aaron_caldwell/32/45755_2.png) [@Aaron\_Caldwell](https://discuss.elastic.co/u/Aaron_Caldwell)\
**Post date:** [August 26, 2020, 9:20pm UTC](https://discuss.elastic.co/t/typeerror-cannot-read-property-key-of-undefined/246461/2 "2020-08-26T21:20:43Z")

</div>

Hello,

It's difficult to determine as this is a fairly dated version of Kibana at this point. It might be worth upgrading to determine if the problem has been fixed, which is very likely!

For reference, [here are Elastic's End of Life dates](https://www.elastic.co/support/eol).

Regards,  
Aaron

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 23, 2020, 9:21pm UTC](https://discuss.elastic.co/t/typeerror-cannot-read-property-key-of-undefined/246461/3 "2020-09-23T21:21:01Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.