Wayland: Loading profile throws error dialog

[Photon89]

Brief summary of issue

When switching profiles in a Wayland session, I get the following error dialog:

Steps to reproduce the issue

1. Launch Shutter, any DE but Wayland session (tested KDE, Gnome, Cinnamon)
2. Create two profiles
3. Load one of the profiles

Error output (please run as shutter --debug)

See screenshot

Extra information, such as Shutter version, display server in use (Xorg or Wayland), operating system and ideas for how to solve:

It's this line:

shutter/bin/shutter

Line 5089 in 15c16ea

$current_monitor_active->set_active($settings_xml->{'general'}->{'current_monitor_active'});

But no idea, why $current_monitor_active is undefined here.