debug 500 error when there is nothing in the PHP log

Question

(still running Sugar Pro 11.0.3 sigh ) 
 I have a 500 error when creating a related Address Location (custom module) on an Account 
 The front end shows: 
 HTTP: 500 Internal Server Error 
 Database failure. Please refer to sugarcrm.log for details. 
 the Console shows the error as: 
 POST https://.../sugarcrm/rest/v11_12/Accounts/f5c5abe6-fcc9-11ee-986b-001a4a160394/link/addlo_addretions_accounts?erased_fields=true&viewed=1 500 (Internal Server Error) 
 Usually for 500 errors I can check the PHP logs and see what's happening but this time there is nothing in the php log and nothing in the sugar log (other than my "fatal" global log statements used to track the progress of some logic hooks) The Address Location is correctly created and saved in the DB. The records are correctly related. So I really don't know why the front end (and any APIs that build the relationship) are failing. 
 There are no failed queries or other suspicious activity in the DB either. 
 Any tips on what else to look at? 
 Thanks, 
 FrancescaS

Francesca Shiekh · Accepted Answer

Francesca Shiekh when that happens what I try to do is find the api and add try catch , 
 
 try{
 //code here ....
 }catch(\Exception $e){$GLOBALS['log']->fatal($e->getMessage());}
 catch(\Throwable $e){ $GLOBALS['log']->fatal($e->getMessage());}