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

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