TYPO3 Core

If you are using the realURL extension and realURL can't determine the requested page path, the method tslib_fe::pageNotFoundAndExit will be called.

Some function-calls later the method checkPageGroupAccess is called, and PHP will crash in line 1188 with this error:

PHP Fatal error:  Call to a member function getRootLine() on a non-object in typo3/sysext/cms/tslib/class.tslib_fe.php on line 1188

This happens because the object "$this->sys_page" is not set in the current tslib_fe instance (is only an empty string), it will be only created if the method "fetch_the_id" was called. But if realURL starts the 404-Error Handling "fetch_the_id" will be never called. So you must check if the object is available:

Code before patching:

// If the actual page has no fe_group, check the rootline for
// inherited fe_group due to extendToSubpage-property
if (intval($row['fe_group']) === 0) {

Code after patching:

// If the actual page has no fe_group, check the rootline for
// inherited fe_group due to extendToSubpage-property
if (intval($row['fe_group']) === 0 && $this->sys_page) {

Here is a backtrace:

typo3/sysext/cms/tslib/class.tslib_fe.php - tslib_fe->checkPageGroupAccess (1270)
typo3/sysext/cms/tslib/class.tslib_fe.php - tslib_fe->getPageAccessFailureReasons (1455)
typo3/sysext/cms/tslib/class.tslib_fe.php - tslib_fe->pageErrorHandler (1421)
typo3/sysext/cms/tslib/class.tslib_fe.php - tslib_fe->pageNotFoundHandler (1379)
typo3conf/ext/realurl/class.tx_realurl.php - tslib_fe->pageNotFoundAndExit (1676)
typo3conf/ext/realurl/class.tx_realurl.php - tx_realurl->decodeSpURL_throw404 (1368)
typo3conf/ext/realurl/class.tx_realurl.php - tx_realurl->decodeSpURL_settingPostVarSets (1176)
typo3conf/ext/realurl/class.tx_realurl.php - tx_realurl->decodeSpURL_doDecode (1021)
 - tx_realurl->decodeSpURL ()
t3lib/class.t3lib_div.php - ->call_user_func_array (4738)
typo3/sysext/cms/tslib/class.tslib_fe.php - t3lib_div->callUserFunction (563)
typo3/sysext/cms/tslib/index_ts.php - tslib_fe->checkAlternativeIdMethods (277)
index.php - ->require (78)