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We have some command bar buttons which have been working fine. However, since Friday afternoon we have been getting errors when you select a command bar button which uses Power FX for the On Select property. Any buttons that run JavaScript are ok.
The error we get when you select the buttons is:- Cannot read properties of null (reading identifier)
Is anyone else seeing this issue in there Command Bar buttons that they have created with Modern Commanding?
We have experienced the same problem with one of our customers beginning this week. I assume Microsoft has pushed through an update over the weekend. Command Bar buttons with PowerFX on select are causing the problem. With tedious debugging by commenting out code, you can find the dataverse reference that is causing the problem. When you find it, it makes no sense why this reference is no longer working but others for the same record are fine. It was always a particular "Self.Selected.Item.xxxx" reference causing the problem, but not all of them. We triple checked, and those references should be fine.
The PowerFX fomula helper thinks the reference is fine and prompts you to use it. You dont get any errors when you define the formula.
No code is executed when you get the error, PowerApps just decides in advance that reference wont work. eg. If your first line of the formula is a plain text Confirm statement (no references), it does not get executed.
I think Microsoft has introduced a bug when parsing the formula at runtime.
We had to workaround for now by creating the record with hardcoded values and then used a synchronous workflow on create to fix it up.
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