The freq is not initialized

[limbo666]

Running on the latest nodemcu firmware (stable channel)
When running the lines one by one the three tones are sounding.

However when a file is saved on the esp file system and I use dofile command to call it, the following error is raised:
PANIC: unprotected error in call to Lua API (bz.lua:12: attempt to concatenate global 'freq' (a nil value))"

It seems that the code cannot initialize the freq variable correctly.

[Hydhen]

Have you changed the code inside buzzer.lua ?

Did you gave an outside range index as second parameter to beep() ?