Lua error on VT switch

I get the following error in the journal when switching away from my desktop VT:

[string "policy-bluetooth.lua"]:121: bad argument #1 to 'find' (string expected, got nil)
stack traceback:
        [C]: in function 'string.find'
        [string "policy-bluetooth.lua"]:121: in upvalue 'isBluez5AudioSink'
        [string "policy-bluetooth.lua"]:389: in function <[string "policy-bluetooth.lua"]:387>

wireplumber 0.4.8
pipewire 0.3.45
bluez 5.63
Arch Linux