/testlink/lib/functions/common.phpna linha 1925

$grants[$r] = ($argsObj->user->hasRight($dbHandler,$r) == 'yes') ? 1 : 0; Esta correção resolve esse erro.

Essa resposta foi a que corrigiu o erro abaixo:

Fatal error: Uncaught Error: Call to a member function hasRight() on null in C:\xampp\htdocs\testlink\lib\functions\common.php:1925 Stack trace: #0 C:\xampp\htdocs\testlink\lib\functions\common.php(1643): getGrantSetWithExit(Object(database), Object(stdClass), Object(testproject), Array) #1 C:\xampp\htdocs\testlink\lib\usermanagement\userInfo.php(22): initUserEnv(Object(database), Object(stdClass)) #2 {main} thrown in C:\xampp\htdocs\testlink\lib\functions\common.php on line 1925