phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '987f8810cd750f3063d7ad2cddff82e7' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('987f8810cd750f3063d7ad2cddff82e7', -1, 1770447723, 1770447723, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php