<p>I'm getting a very similar error too when trying to debug a C application (just a simple hello world program) with Geany 1.23.1 I've selected the correct program for the Target location</p>
<blockquote>
<p>(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: g_string_free: assertion 'string != NULL' failed<br>
(geany:5691): GLib-CRITICAL **: Source ID 1196 was not found when attempting to remove it<br>
Segmentation fault (core dumped)</p>
</blockquote>

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