Leaving search channel leads to notices

[beberlei]

If i search for a channel and then leave it notices appear in teh server log, because the updating of the search term is always rescheduled and it appears twircd wants to write the contents to channel although its not open anymore:

Notice: Undefined index: #doctrine in /home/benny/code/php/projects/twircd/src/classes/client/twitter.php on line 128

Call Stack:
    0.0003     328312   1. {main}() /home/benny/code/php/projects/twircd/src/server.php:0
    0.0419     855940   2. TwIRCd\Server->run() /home/benny/code/php/projects/twircd/src/server.php:37
    0.0421     856088   3. TwIRCd\Irc\Server->run() /home/benny/code/php/projects/twircd/src/classes/server.php:123
 6719.1565     922436   4. call_user_func() /home/benny/code/php/projects/twircd/src/classes/irc/server.php:189
 6719.1565     922436   5. TwIRCd\Server->check() /home/benny/code/php/projects/twircd/src/classes/irc/server.php:0
 6719.1565     922436   6. TwIRCd\Client->getUpdates() /home/benny/code/php/projects/twircd/src/classes/server.php:138
 6719.1565     922812   7. call_user_func_array() /home/benny/code/php/projects/twircd/src/classes/client.php:265
 6719.1565     922988   8. TwIRCd\Client\Twitter->getSearchResults() /home/benny/code/php/projects/twircd/src/classes/client.php:0