XF 1.5 Upgrade Server Error (1.5.11)

#1
While attempting to upgrade to 1.5.11 from 1.5.4 I'm seeing the following server error:

Server Error
Mysqli statement execute error : Duplicate entry '0-ajaxProgress' for key 'definition_style_id_property_name'
  1. Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297
  2. Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479
  3. Zend_Db_Adapter_Abstract->query() in Zend/Db/Adapter/Abstract.php at line 574
  4. Zend_Db_Adapter_Abstract->insert() in XenForo/DataWriter.php at line 1638
  5. XenForo_DataWriter->_insert() in XenForo/DataWriter.php at line 1627
  6. XenForo_DataWriter->_save() in XenForo/DataWriter.php at line 1419
  7. XenForo_DataWriter->save() in XenForo/Model/StyleProperty.php at line 2400
  8. XenForo_Model_StyleProperty->importStylePropertiesFromArray() in XenForo/Model/StyleProperty.php at line 2312
  9. XenForo_Model_StyleProperty->importStylePropertyXml() in XenForo/Model/StyleProperty.php at line 2245
  10. XenForo_Model_StyleProperty->importStylePropertyDevelopmentXml() in XenForo/Deferred/ImportMasterData.php at line 26
  11. XenForo_Deferred_ImportMasterData->execute() in XenForo/Deferred/Atomic.php at line 66
  12. XenForo_Deferred_Atomic->execute() in XenForo/Model/Deferred.php at line 295
  13. XenForo_Model_Deferred->runDeferred() in XenForo/Model/Deferred.php at line 429
  14. XenForo_Model_Deferred->_runInternal() in XenForo/Model/Deferred.php at line 355
  15. XenForo_Model_Deferred->runByUniqueKey() in XenForo/Install/Controller/Abstract.php at line 34
  16. XenForo_Install_Controller_Abstract->_manualDeferredRunner() in XenForo/Install/Controller/Upgrade.php at line 221
  17. XenForo_Install_Controller_Upgrade->actionRunDeferred() in XenForo/FrontController.php at line 351
  18. XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
  19. XenForo_FrontController->run() in /nfs/c06/h02/mnt/184948/domains/forum.dvunderground.com/html/install/index.php at line 18
 
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