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XF 1.5 Mysqli Error

#1
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!