GLib-CRITICAL **: g_main_loop_quit: assertion 'g_atomic_int_get (&loop->ref_count) > 0' failed

[kernc]

On two consecutive Ctrl+C presses, this is the error. The windows were not unsuspended; I continued them with pkill -CONT ..

$ src/xsuspender
^C^C
(xsuspender:17474): GLib-CRITICAL **: g_main_loop_quit: assertion 'g_atomic_int_get (&loop->ref_count) > 0' failed