[SOLVED]After use this block my app got white screen

Hi, after the update use "make list from text "lock my app with white screen.
But before updateI never had problems with this block…
Look your self

If i remove this block white screen does not appear.
I have the same result if i try it on iphone or android phone.

Solved, i just add a if value not null and now work, but before worked also without it.