Nothing happens when the "Help" button is pressed.

Logging output when clicking "Help":

(xfce4-taskmanager:2639146): GLib-GObject-WARNING **: 00:22:35.767: invalid cast from 'GtkButton' to 'GtkWindow'

(xfce4-taskmanager:2639146): libxfce4ui-CRITICAL **: 00:22:35.767: IA__xfce_dialog_show_help_with_version: assertion 'parent == NULL || GTK_IS_WINDOW (parent)' failed

mentioned in merge request !24 (merged)

closed with commit 644f874d

assigned to @huntertur

changed milestone to %1.5.3