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Super User

Error "Cannot read property 'exists' of Null" when adding a new action on an already existing Flow

Hi all

I have an already existing Flow, just some minutes ago I opened it to add a new action block, but I can't since Flow editor is showing the following error:



It's a bit difficult for me to share screenshots of the flow logic since it is a bit complex (more than 10 action blocks, 2 conditions, 1 foreach); if you find it valuable I can export it and share the .zip file instead


Thank you in advance!

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Accepted Solutions
Advocate III
Advocate III

had the same, just save you flow, go to My Flows then back again edit your flow, message disappears

View solution in original post

Advocate III
Advocate III

had the same, just save you flow, go to My Flows then back again edit your flow, message disappears

Not applicable

I have the same issue.  I'm trying to add new actions to my flow and it keeps telling me "Cannot read property 'exists" of null".


I tried to save my flow and restart, but it isn't going away. Any other ideas?

Hi @Anonymous, @efialttes and @ch2017


I did a lot of tests and discover that the problem is a cache - simple press CTRL + SHIFT + R and it workarounds the problem.


We are waiting for a fix


Best Regards,


Gustavo Moraes

Did I answer your question? Mark my post as a solution!

Gustavo Moraes, o astronauta brasileiro do Flow!

Hi all,


Apologize for the current situation.

This is a known issue, and a fix is being published this week.



To workaround this, please take a try to refresh the current editing page, which should be able to get the Add new Action work.




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

I hope this is resolves sooner rather than later as it's hard to finish a flow when you cannot edit it. Guess the customer just have to be patient.

Mikael Svenson
Microsoft MVP

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