ArrowChat

I just recently did an automatic upgrade to v1.0.31 and the chat is not loading now. In the javascript error console I see that the /arrowchat/external.php?type=js is throwing an error. When I look in the file, I see the following:

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<br />
<b>Notice</b>:  Undefined variable: start_time in <b>PATH_TO_ARROWCHAT/external.php</b> on line <b>286</b><br />

So I just commented out the lines with start_time in them and chat functions. But I don't know why this error is being thrown.

I can see near the top of external.php where start_time is defined:

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// Start execution timer
$micro_time = microtime();
$micro_time = explode(" ",$micro_time);
$micro_time = $micro_time[1] + $micro_time[0];
$start_time = $micro_time;

Any idea what might be the cause?