Project raised exception class 10

[dlucic 1]

I am developing an android application on Delphi 12. My application connects to a DataSnap server. Some times, but not every time, my application throws this exception. Once when the application starts, the second time when a new form is opened and sometimes everything works without error

 

I suppose everything crashes on line 312 in this module

 

 

Those any one know the reason of this?