Error with posts select and Select2 (CFS v2.5.16)

Hi!, After updating, when I try to select a specific post to show my Custom Fields, select2 field hangs on searching. The other select2 works normally.
The post I’m trying to select exists, and it worked before the update to v2.5.16. It’s just me?

Image: https://ibb.co/Sc9bzK0

The console show the next error:

select2.min.js:22 Uncaught TypeError: Cannot read property 'length' of null
    at d.<anonymous> (select2.min.js:22)
    at Object.callback (select2.min.js:21)
    at Object.success (select2.min.js:21)
    at i (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=5.2:2)
    at Object.fireWith [as resolveWith] (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=5.2:2)
    at y (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=5.2:4)
    at XMLHttpRequest.c (load-scripts.php?c=1&load[]=jquery-core,jquery-migrate,utils&ver=5.2:4)