Custom Command > Undefined "The page at app://{60095677-2f7e-4d8b-8622-6a71221..

Hello guys,
I'm running lrc over a ZTE open celphone and Debian Wheezy and each time that I execute a custom
command i get the message:

The page at app://{60095677-2f7e-4d8b-8622-6a71221035b5} says:

---

undefined

Ok (Button)

[316k]

Where do you get this message ? What application displays it ?

I get this message on the cellphone each time that i execute a custom command

[316k]

The cellphone prints that ? Is it a Firefox OS message dialog ?

I get this!

[316k]

Ok, I'll check that.

[Agneli]

True, I had already seen this error but have not found the location of the problem.
This apparently happens when we execute a command that has no return, as "xdotool key XF86AudioPlay" to start a song for example.
I belive that's it.