Uncaught TypeError: Cannot read property 'length' of undefined

• Elliot

• May 29, 2015 at 10:36 am

Hi @andytc

Thanks for the info. Can you please add the following to you wp-config.php

define('WP_DEBUG', true);
define('SCRIPT_DEBUG', true);

Then check your JS errors again (should now have line numbers instead of minified), please report back with the new JS errors

Thanks
E

• davemac

• May 29, 2015 at 10:43 am

It looks like 5.2.6 has fixed the issue for me, across multiple sites.

As Elliot mentioned back up the thread, make sure your browser is not caching older JS.

• Elliot

• May 29, 2015 at 10:50 am

Hi @davemac

This is great feedback! Thanks mate

• davemac

• June 3, 2015 at 3:06 pm

Ooopps I spoke to soon!

Issue is still happening, although only now on a couple of my larger sites.

• Elliot

• June 4, 2015 at 10:05 am

Hi @andytc

Thanks for the info.

Can you please add the following to your wp-config.php and refresh the page?
You should notice that the console log contains un-minified errors which will help me debug the issue.

define('WP_DEBUG', true);
define('SCRIPT_DEBUG', true);

Thanks
E

• ebiebzh0

• June 26, 2015 at 6:06 pm

hello,

after an update yesterday to 5.2.7. this is now happening to my sites.

do you need a debug log?

thank you,
sissi

• Elliot

• June 30, 2015 at 10:59 am

Hi @ebiebzh0

yes. I will need a copy of your console log errors, and a detailed issue report with steps to replicate the issue / login details to see the issue myself.

• hachesilva

• August 28, 2015 at 12:19 pm

Hi @elliot

I´m having this exact same error trying to create a post that doesn´t even have ACFs attached to. Going back to 5.2.3 doesn´t solve the problem, so I´m stuck there.

Any way to fix this temprarily?

• davemac

• August 28, 2015 at 1:45 pm

For me, this issue turned out to be (very persistent) caching and wasn’t related to ACF.