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Unable to save my flow: 'NullReferenceException'

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About a month ago I edited and saved the cloud flow without any problems.
Recently, I found that I cannot save the flow with the following error message: Http request failed with unhandled exception of type 'NullReferenceException' and message: 'Object reference not set to an instance of an object.'.
 
To narrow down the problem, I deleted actions in the flow one by one, and found I can save it if I delete a Parse JSON action.
Since I can save the flow before and also I use the similar action in other flows, it seems the problem is not in the action, but in the dotnet program implementing to save a flow.
 
Is there any workaround other than deleting the action?
 
 
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