org\guzaba\framework\kernel\exceptions\errorException

PHP error:
"Trying to get property of non-object"

On line 91 in file ./cms/artists/controllers/view_artist.php.
#0 /home/arturgal/public_html/cms/artists/controllers/view_artist.php(91): org\guzaba\framework\kernel\classes\kernel->_error_handler(8, 'Trying to get p...', '/home/arturgal/...', 91, Array)
#1 [internal function]: org\guzaba\cms\artists\controllers\view_artist->main()
#2 /home/arturgal/public_html/framework/mvc/classes/executor.php(179): call_user_func_array(Array, Array)
#3 /home/arturgal/public_html/framework/mvc/classes/executor.php(89): org\guzaba\framework\mvc\classes\executor->execute()
#4 /home/arturgal/public_html/framework/mvc/classes/executor.php(74): org\guzaba\framework\mvc\classes\executor->main_process()
#5 /home/arturgal/public_html/framework/kernel/classes/kernel.php(257): org\guzaba\framework\mvc\classes\executor->__construct(Object(org\guzaba\framework\mvc\classes\environment))
#6 [internal function]: org\guzaba\framework\kernel\classes\kernel->exec_runlevel_1()
#7 /home/arturgal/public_html/framework/kernel/classes/kernel.php(165): call_user_func_array(Array, Array)
#8 /home/arturgal/public_html/index.php(41): org\guzaba\framework\kernel\classes\kernel->execute()
#9 {main}

Array ( [app] => cms [p] => artists [c] => view_artist [a] => main [id] => 46 [rw] => Румен-Читов )