Is there a default value I can specify for a string to avoid "Object reference not set to an instance of an object." error?

@Sachingoudar wrote:

Hi,
I am trying to Assign a string variable at the beginning of Process.xaml in REF to read the in_Transaction variable, which is ‘Null’ or ‘0’. But I am being thrown out with below error. “Assign: Object reference not set to an instance of an object.”.

So I am thinking that default value to string variable would resolve this error?

Thx!

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