Hope I'm posting in the right place here! Basically, my forum had some database issues on Friday, leading our tech guy to try and rebuild the forum's master data. On doing this, he encountered the following error and is now unsure what queries he needs to run in order to fix the problem. Code: Mysqli statement execute error : Duplicate entry '0-ajaxProgress' for key 'definition_style_id_property_name' Zend_Db_Statement_Mysqli->_execute() in Zend/Db/Statement.php at line 297 Zend_Db_Statement->execute() in Zend/Db/Adapter/Abstract.php at line 479 Zend_Db_Adapter_Abstract->query() in Zend/Db/Adapter/Abstract.php at line 574 Zend_Db_Adapter_Abstract->insert() in XenForo/DataWriter.php at line 1638 XenForo_DataWriter->_insert() in XenForo/DataWriter.php at line 1627 XenForo_DataWriter->_save() in XenForo/DataWriter.php at line 1419 XenForo_DataWriter->save() in XenForo/Model/StyleProperty.php at line 2400 XenForo_Model_StyleProperty->importStylePropertiesFromArray() in XenForo/Model/StyleProperty.php at line 2312 XenForo_Model_StyleProperty->importStylePropertyXml() in XenForo/Model/StyleProperty.php at line 2245 XenForo_Model_StyleProperty->importStylePropertyDevelopmentXml() in XenForo/Deferred/ImportMasterData.php at line 26 XenForo_Deferred_ImportMasterData->execute() in XenForo/Deferred/Atomic.php at line 66 XenForo_Deferred_Atomic->execute() in XenForo/Model/Deferred.php at line 295 XenForo_Model_Deferred->runDeferred() in XenForo/Model/Deferred.php at line 429 XenForo_Model_Deferred->_runInternal() in XenForo/Model/Deferred.php at line 355 XenForo_Model_Deferred->runByUniqueKey() in XenForo/Install/Controller/Abstract.php at line 34 XenForo_Install_Controller_Abstract->_manualDeferredRunner() in XenForo/Install/Controller/Upgrade.php at line 221 XenForo_Install_Controller_Upgrade->actionRunDeferred() in XenForo/FrontController.php at line 351 XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134 XenForo_FrontController->run() in D:/Websites/Diabetes.co.uk/forum/install/index.php at line 18 If anyone's able to offer any tips on fixing the issue, it'd be much appreciated. Thanks!