What is supposed to be inside `$vn(variable2)`?
My guess is that the crash happens because the `SETEX` command parameters are expecting extra values (arguments) due to `%s` specifier. See the content of the command:
``` SETEX ACTIVECHANNELS_swp3pvm7jqpnu6ixphj1jc7c24@sipgate.de 21600 \n%swp3pvm7jqpnu6ixphj1jc7c24@sipgate.de\022\n1234567e16\032\n4912345678"%swp3pvm7jqpnu6ixphj1jc7c24@sipgate.de ```
Does the value of `$vn(variable2)` is what you would expect (it's what after 21600 in the cmd)?