As of 1a3078eab93491dfd794916fc05729b98ab300f2, crawler-add segfaults if invoked with no parameters (after displaying the usage message).
$ crawler-add
Usage: crawler-add [OPTIONS] URI
OPTIONS is one or more of:
-h Print this usage message and exit
-c PATH Load PATH as the configuration file
Segmentation fault
$
As of 1a3078eab93491dfd794916fc05729b98ab300f2,
crawler-add
segfaults if invoked with no parameters (after displaying the usage message).