PLEG issue (Problem decoding) popup

I do have a logic action that reports humidity via push over.
That action itself works well but when I try to edit the lua code I get a browser popup saying “Problem decoding” only when the percentage symbol is in the code below :

pushover (“”,"Hum. Kitchen\t = "…T6 … “%\r”
…"Temp. Living\t = " …T0R …"C / " …T1R …“F\r”
…"Temp. Kitchen\t = " …T4R …"C / " …T5R …“F\r”
…"Temp. Pool\t = " …T2R …"C / " …T3R …“F”, “”, " ", " ", “gamelan”)

Any idea ?