It seems that it's theme related.
Try this:
Go to templates > siropu_custom_tabs_child_list and replace
With this:Code:{$child.depth} > 1 AND !{$selected}
Code:{$child.depth} > 1
Mysqli statement execute error : Out of range value for column 'tab_order' at row 1
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 632
Zend_Db_Adapter_Abstract->update() in XenForo/DataWriter.php at line 1640
XenForo_DataWriter->_update() in XenForo/DataWriter.php at line 1609
XenForo_DataWriter->_save() in XenForo/DataWriter.php at line 1405
XenForo_DataWriter->save() in Siropu/CustomTabs/ControllerAdmin.php at line 64
Siropu_CustomTabs_ControllerAdmin->actionSave() in XenForo/FrontController.php at line 347
XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
XenForo_FrontController->run() in /****/admin.php at line 13
@Eagle, if you are using a similar Add-on with Custom Tabs, that might be the problem.
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