I get it for both your apps:
#0 /var/www/myforum.com/public_html/forum/system/Dispatcher/Front.php(466): IPS\_Widget::load(Object(IPS\jimmotoppostersplus\Application), 'jimmoTopPosters...', 'w6ybd7ryk', Array, NULL, 'vertical')
#1 /var/www/myforum.com/public_html/forum/init.php(434) : eval()'d code(57): IPS\Dispatcher\_Front->finish()
#2 /var/www/myforum.com/public_html/forum/system/Dispatcher/Dispatcher.php(131): IPS\Dispatcher\chat_hook_tabNewWindow->finish()
#3 /var/www/myforum.com/public_html/forum/index.php(13): IPS\_Dispatcher->run()
#4 {main}
It's very frequent and odd considering I disabled it last night when I first started to see the error.