Bug “KeyError: 'payload'“ in backdoor.py

[One-sixth]

I tried using backdoor.py to turn on readback mode. Then found this problem. My frida version is 15.1.17 .

And then I check the var message. Then I got Line 7 in backdoor.py

def on_message(message, data):
    print(message) # check var
    if (message["payload"]=="Output"):

I replace line 20 in backdoor.py

lang=Module.findExportByName("kernel32","GetSystemDefaultLCID");

to

var lang=Module.findExportByName("kernel32","GetSystemDefaultLCID");

then the bug is gone.