Crash when trying to add Media player by Index binding in Background Rack

Tags: #<Tag:0x00007ff41a4e1900> #<Tag:0x00007ff41a4e15e0> #<Tag:0x00007ff41a4e1400>

In the Background Rack.

Add a binding for
‘Media Player by Index’, ‘Is playing’
to
‘Media Player by Index’ ‘Color’ (sic)

Cantabile either crashes immediately, or crashes when I try to make the Media Player play.