array(4 items)
   caller => 'TYPO3\CMS\Core\Database\DatabaseConnection::exec_INSERTquery' (60 chars)
   ERROR => 'Column 'searchstring' cannot be null' (36 chars)
   lastBuiltQuery => 'INSERT INTO index_stat_search (searchstring,searchoptions,feuser_id,cookie,I
      P,hits,tstamp) VALUES (NULL,'a:3:{i:0;a:11:{s:9:\"extResume\";s:1:\"1\";s:4:
      \"type\";s:2:\"20\";s:5:\"group\";s:4:\"flat\";s:4:\"lang\";s:1:\"0\";s:12:\
      "freeIndexUid\";i:-1;s:7:\"results\";i:10;s:5:\"defOp\";i:0;s:8:\"sections\"
      ;i:0;s:5:\"media\";i:-1;s:5:\"order\";s:5:\"mtime\";s:4:\"desc\";i:0;}i:1;a:
      1:{i:0;a:2:{s:5:\"sword\";s:0:\"\";s:4:\"oper\";s:3:\"AND\";}}i:2;a:3:{i:0;d
      :1573647876273;i:1;d:1573647877201;i:2;d:1573647877293;}}','0','13','3.91.10
      6.44','13656','1573647876')' (559 chars)
   debug_backtrace => 'require(rc-8.7.13/typo3/sysext/frontend/Resources/Private/Php/frontend.php),
      rc-8.7.13/index.php#3 // {closure}#24 // TYPO3\CMS\Frontend\Http\Application
      ->run#23 // TYPO3\CMS\Core\Core\Bootstrap->handleRequest#79 // TYPO3\CMS\Fro
      ntend\Http\RequestHandler->handleRequest#315 // TYPO3\CMS\Frontend\Controlle
      r\TypoScriptFrontendController->INTincScript#225 // TYPO3\CMS\Frontend\Contr
      oller\TypoScriptFrontendController->recursivelyReplaceIntPlaceholdersInConte
      nt#3461 // TYPO3\CMS\Frontend\Controller\TypoScriptFrontendController->INTin
      cScript_process#3494 // TYPO3\CMS\Frontend\ContentObject\ContentObjectRender
      er->cObjGetSingle#3532 // TYPO3\CMS\Frontend\ContentObject\ContentObjectRend
      erer->render#736 // TYPO3\CMS\Frontend\ContentObject\UserContentObject->rend
      er#820 // TYPO3\CMS\Frontend\ContentObject\ContentObjectRenderer->callUserFu
      nction#41 // call_user_func_array#6337 // TYPO3\CMS\Compatibility7\Controlle
      r\SearchFormController->main# // TYPO3\CMS\Compatibility7\Controller\SearchF
      ormController->doSearch#214 // TYPO3\CMS\Compatibility7\Controller\SearchFor
      mController->writeSearchStat#546 // TYPO3\CMS\Core\Database\DatabaseConnecti
      on->exec_INSERTquery#1493 // TYPO3\CMS\Core\Database\DatabaseConnection->deb
      ug#218' (1222 chars)