Hi all. I have a bit of trouble with updating a string in SharePoint list items if the field is blank. I have tried to do a combination af Coalese and Replace, but it fails for me everytime. All I want is to avoid the "null errors" whenthe flow runs. The flow is at this time pretty simple:
A select component to pick the columns I need to make changes to:

A for each control, where I want to make the magic:

I have tried several things, for example:
Coalese(item()?['Column3'],'',replace(item()?['Column3'],'Old text','New text'))
if(coalesce(item()?['Column3'],'',replace(item()?['Column3'],'Old text','New text')))
Can anyone guide me in a correct direction, so I can make the changes to the list items without getting the "null error" when the field is blank. All I want is that if the field is not blank, then I need to replace a string, but I keep running into these "Null errors".
Thanks in advance
/Frank