[Lazarus] debugger create SIGDEV and app terminate

[FreeMan]

Hello,
fpc r32922 lazarus r49987 el capitan qt x64

code is:
........
finally
     Screen.Cursor := crDefault;
     Background := False;
     try
       if Assigned(FRM_) then begin
         if FRM_.MEM_.State in[dsEdit, dsInsert]then FRM_.MEM_.Cancel;
         FRM_.MEM_.Close;
         FreeAndNil(FRM_);
       end;
     except
     end;
   end;

I get this error and application terminate

Project project1 raised exception class 'External: SIGSEGV'.

In file 'src/Randevu/Appointment.pas' at line 1182:

if FRM_.MEM_.State in[dsEdit, dsInsert]then FRM_.MEM_.Cancel;


This error create if debugger is active. But I can NOT remove debug info 
while compile. Allways debug info adding to compiled application. 
CrossCompile as well.
In  "Project Options --> Debugging --> Generate debugging info for GDB 
(slower / increase exe-size) this checkbox True or False. *NOT* affect

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