my admin is not opening and showing error page

  • My www.remarpro.com updated to new version but after that my admin panel https://jazbat.com/wp-admin/ is giving error like this…

    Notice: Undefined index: in /home/jazbatco/public_html/wp-content/plugins/jetpack/class.jetpack-user-agent.php on line 97

    Warning: Cannot modify header information – headers already sent by (output started at /home/jazbatco/public_html/wp-content/plugins/jetpack/class.jetpack-user-agent.php:97) in /home/jazbatco/public_html/wp-includes/pluggable.php on line 1174

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    Not only that my www.remarpro.com site is giving error in header like this…

    Notice: Undefined index: in /home/jazbatco/public_html/wp-content/plugins/jetpack/class.jetpack-user-agent.php on line 97
    —–
    How to fix this…please help.

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