Showing results for 
Search instead for 
Did you mean: 
Kudo Kingpin
Kudo Kingpin

[URGENT] Error while using PowerApps Studio



I'm always getting an error while using PowerApps Studio on Web version.

This is the error:

WebAuthoring abnormal termination.
Client date/time: 2017-07-19T16:10:23.307Z
Version: 2.0.663
Session ID: 67ee0322-37d0-0a7f-8b80-147321ccb38c
description: {"error":{"isTrusted":true,"detail":{"exception":{}},"message":"Uncaught TypeError: Cannot read property 'length' of null","filename":"","lineno":... TypeError: Cannot read property 'length' of null","setPromise":"[function]","exception":{}}
stack: null
errorNumber: 0
errorMessage: Uncaught TypeError: Cannot read property 'length' of null

Does it happens to anyone else?

I'm getting this error since the last update...


Best regards,

Jorge Moreira


Community Support
Community Support

Hi jmoreira_myp,


Which browser are you using? Please try to clear the browser cache and login with InPrivate mode to see if it will work.


I have seen a similar issue on another thread, @AndyPennell has made some suggestions on this issue, please also try if the suggestions will work for you. The thread link is:


I will also keep an eye on the similar thread in case there are any updates on this issue.

Best regards,
Mabel Mao

Community Support Team _ Mabel Mao
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

Hi @v-yamao-msft,


I just tried your suggestions but nothing worked...

I also saw the thread but that's not my case! As @AndyPennell said, the problem is having a form inside a Gallery, and I've nothing with that... I have this error while performing screen order (the only pattern I discovered 'till now).

Any other suggestion?


Best regards,

Jorge Moreira

Helpful resources

PA_User Group Leader_768x460.jpg

Manage your user group events

Check out the News & Announcements to learn more.

Power Query PA Forum 768x460.png

Check it out!

Did you know that you can visit the Power Query Forum in Power BI and now Power Apps

Carousel 2021 Release Wave 2 Plan 768x460.jpg

2021 Release Wave 2 Plan

Power Platform release plan for the 2021 release wave 2 describes all new features releasing from October 2021 through March 2022.

R2 (Green) 768 x 460px.png

Microsoft Dynamics 365 & Power Platform User Professionals

DynamicsCon is a FREE, 4 half-day virtual learning experience for 11,000+ Microsoft Business Application users and professionals.

Users online (1,342)