My system journal is cluttered with QML errors like:

plasmashell[64794]: file:///usr/share/plasma/packages/org.kde.paneltoolbox/contents/ui/main.qml:31: TypeError: Cannot read property 'formFactor' of null

Is there any way to get Qt applications to just be quiet about that sort of thing? Using QT_LOGGING_RULES I can shut off all warning messages to get rid of them, but is there any way to get rid of just those messages while leaving other warning messages?