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XF 1.5 Mysqli errors that started this morning

#1
I haven't done any updates or other changes to the website in many weeks, but this morning when trying to access http://ftog.net I am getting these errors:

Code:
An exception occurred: Mysqli statement execute error : Incorrect arguments to mysqld_stmt_execute in /homepages/14/d168598602/htdocs/ftog_xenforo/library/Zend/Db/Statement/Mysqli.php on line 214

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 808
Zend_Db_Adapter_Abstract->fetchPairs() in XenForo/Template/Public.php at line 130
XenForo_Template_Public->_getTemplatesFromDataSource() in XenForo/Template/Abstract.php at line 572
XenForo_Template_Abstract->_loadTemplates() in XenForo/Template/Abstract.php at line 556
XenForo_Template_Abstract->_loadTemplate() in XenForo/Template/Abstract.php at line 180
XenForo_Template_Abstract->render() in XenForo/Template/Public.php at line 110
XenForo_Template_Public->render() in XenForo/ViewRenderer/HtmlPublic.php at line 139
XenForo_ViewRenderer_HtmlPublic->renderContainer() in XenForo/FrontController.php at line 633
XenForo_FrontController->renderView() in XenForo/FrontController.php at line 158
XenForo_FrontController->run() in /homepages/14/d168598602/htdocs/ftog_xenforo/index.php at line 13
And when I try to access http://ftog.net/admin.php

Code:
Server Error

Mysqli statement execute error : Incorrect arguments to mysqld_stmt_execute

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/Session.php at line 855
XenForo_Session->saveSessionToSource() in XenForo/Session.php at line 573
XenForo_Session->save() in XenForo/Controller.php at line 414
XenForo_Controller->updateSession() in XenForo/Controller.php at line 358
XenForo_Controller->postDispatch() in XenForo/FrontController.php at line 354
XenForo_FrontController->dispatch() in XenForo/FrontController.php at line 134
XenForo_FrontController->run() in /homepages/14/d168598602/htdocs/ftog_xenforo/admin.php at line 13
I have no idea where to even start trying to fix this and I would appreciate any help I could get from the community. I have source code and PHPMyAdmin access to the database so I can run queries if needed.