Problems with an unknown Report Property

Hi everyone. I'm with a problem with a property returned from a a!queryProcessAnalytics from a Report.

The Report returns this data:

 

And I have a problem with a dp0 field that is mentioned on the column configs as the task details:

I get that field in this way:

And I put all that data in a grid on an interface, but sometimes I get this error:

And I show it like this on the interface:

Thanks for everyone who can help me with this problem!

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