Trigger on_shutdown in the event of a fatal error.

lib/API/Std.pm

@@ -485,7 +485,10 @@ sub err ## no critic qw(Subroutines::ProhibitBuiltinHomonyms)
     }
 
     # If it's a fatal error, exit the program.
-    if ($fatal) { exit; }
+    if ($fatal) {
+        API::Std::event_run('on_shutdown');
+        exit; 
+    }
 
     return 1;
 }