unable to login after idle time - Joomla! Forum - community, help and support

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i have migrated joomla site new server (ec2 ubuntu server)

but now, problem on "new server" site: whenever leave website idle 50 minutes (at homepage screen) , refresh page, error on homepage:

notice: trying property of non-object in /var/www/.../libraries/joomla/factory.php on line 223 notice: trying property of non-object in /var/www/.../components/com_community/libraries/user.php on line 50

and if try login error message: "your session has expired. please log in again."

note can override restarting browser (same ie, firefox, chrome) , works fine. idk if there's setting should modify in server or what. i've tried month , search issue in lots , lots of forums no solution :(

i problem in 2 different computers. able help. in advance

anyone?





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