wf-panel crashes after playing a song on spotify

[dxcy47]

Describe the bug
whenever i open spotify and play a song, wf-panel crashes

To Reproduce
Steps to reproduce the behavior:

1. open spotify
2. play a song
3. wf-panel crashes
   (note: it only crashes after playing a song. if i keep spotify open without playing anything it still works fine)

Expected behavior
expected wf-panel to work as normal without crashing after opening spotify

Screenshots or stacktrace

II 13-12-24 16:56:27.275 - [subprojects/wf-config/src/file.cpp:579] Reading XML configuration options from directory /opt/wayfire/share/wayfire/metadata/wf-shell
II 13-12-24 16:56:27.275 - [subprojects/wf-config/src/file.cpp:529] Reading XML configuration options from file /opt/wayfire/share/wayfire/metadata/wf-shell/background.xml
II 13-12-24 16:56:27.275 - [subprojects/wf-config/src/file.cpp:529] Reading XML configuration options from file /opt/wayfire/share/wayfire/metadata/wf-shell/dock.xml
II 13-12-24 16:56:27.275 - [subprojects/wf-config/src/file.cpp:529] Reading XML configuration options from file /opt/wayfire/share/wayfire/metadata/wf-shell/panel.xml
EE 13-12-24 16:56:27.276 - [subprojects/wf-config/src/file.cpp:341] Error in file /home/decoy/.config/wf-shell.ini:100, invalid option value!
EE 13-12-24 16:56:27.276 - [subprojects/wf-config/src/file.cpp:341] Error in file /home/decoy/.config/wf-shell.ini:100, invalid option value!
Error loading file: /usr/share/icons/gnome/48x48/categories/preferences-system.png
target button 508
set width 192

** (wf-panel:2594): ERROR **: 16:56:36.190:
unhandled exception (type std::exception) in signal handler:
what: map::at

fish: Job 1, 'wf-panel' terminated by signal SIGTRAP (Trace or breakpoint trap)

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this is the whole log from starting wf-panel to it crashing

Wayfire version
wayfire-git 0.9.0 installed with wf-install