title: Cron not work - exception 'Mage_Core_Exception' with message 'Mage registry key "_singleton/admin/session" already exists'
body: <p>Before it was missed or skipped.</p>
  
  <p>Now it only stays in pending, when I added my email I started to see the problem, and not think one the solution.</p>
  
  <pre><code>cpanel cron = 
  */5 * * * * /bin/bash /home/adesi075/public_html/scheduler_cron.sh --mode always
  */5 * * * * /bin/bash /home/adesi075/public_html/scheduler_cron.sh --mode default
  </code></pre>
  
  <p><strong>I set up to send me an email</strong></p>
  
  <pre><code>exception 'Mage_Core_Exception' with message 'Mage registry key "_singleton/admin/session" already exists' in /home/adesi075/public_html/app/Mage.php:595
  Stack trace:
  #0 /home/adesi075/public_html/app/Mage.php(223): Mage::throwException('Mage registry k...')
  #1 /home/adesi075/public_html/app/Mage.php(477): Mage::register('_singleton/admi...', Object(Mage_Admin_Model_Session))
  #2 /home/adesi075/public_html/app/code/community/Aoe/Scheduler/Model/Schedule.php(560): Mage::getSingleton('admin/session')
  #3 /home/adesi075/public_html/app/code/core/Mage/Core/Model/Abstract.php(316): Aoe_Scheduler_Model_Schedule-&gt;_beforeSave()
  #4 /home/adesi075/public_html/app/code/community/Aoe/Scheduler/Model/ScheduleManager.php(43): Mage_Core_Model_Abstract-&gt;save()
  #5 /home/adesi075/public_html/app/code/community/Aoe/Scheduler/Model/Observer.php(34): Aoe_Scheduler_Model_ScheduleManager-&gt;skipMissedSchedules()
  #6 /home/adesi075/public_html/app/code/core/Mage/Core/Model/App.php(1358): Aoe_Scheduler_Model_Observer-&gt;dispatch(Object(Varien_Event_Observer))
  #7 /home/adesi075/public_html/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App-&gt;_callObserverMethod(Object(Aoe_Scheduler_Model_Observer), 'dispatch', Object(Varien_Event_Observer))
  #8 /home/adesi075/public_html/app/Mage.php(448): Mage_Core_Model_App-&gt;dispatchEvent('default', Array)
  #9 /home/adesi075/public_html/shell/scheduler.php(519): Mage::dispatchEvent('default', Array)
  #10 /home/adesi075/public_html/shell/scheduler.php(37): Aoe_Scheduler_Shell_Scheduler-&gt;cronAction()
  #11 /home/adesi075/public_html/shell/scheduler.php(545): Aoe_Scheduler_Shell_Scheduler-&gt;run()
  #12 {main}Set-Cookie: adminhtml=92f4f6e5b55a55a7a99d040eaa2d4e2c; expires=Tue, 21-Feb-2017 17:55:02 GMT; Max-Age=3600; path=/; HttpOnly
  Expires: Thu, 19 Nov 1981 08:52:00 GMT
  Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
  Pragma: no-cache
  Content-type: text/html; charset=UTF-8
  </code></pre>
  
  <p>How to solve this problem?</p>