How to use variable initialization

[Bird]

Apps created with "PowerApps" I am making a flow to write to an Excel file with "PowerAutomate".

When the value to enter a value  in "PowerApps" is blank, Using initialize variables (type: string) in the "PowerAutomate" flow causes an error. Is there a way around it? 

[gabibalaban]

@Bird ,

Use the coalesce function:

Coalesce(parameterFromPowerApps,’’)

[Bird]

@gabibalaban 

There is no Coalesce in "Add new step", how do I do it?

[gabibalaban · Accepted solution]

Coalesce() is a function. You need to use in add an expression (fx). Here is an example: