BUG: segfault when the module specified in the config is not present

Tried to run lektord and got the error:

Thread 1 "lektord/daemon" received signal SIGSEGV, Segmentation fault.
0x00005555555795d7 in __reg_func (reg=0x0, name=0x5555555a4df9 "new") at /home/baka/lektor/src/base/reg.c:37
37          for (i = 0; (reg + i)->name && (reg + i)->func; ++i) {

The module specified in the config was qt_window, mais dans le reg du serveur (lektord) il était renseigné avec le nom qt...