phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '1849507821c6f432519de70b9577e988' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('1849507821c6f432519de70b9577e988', -1, 1508338930, 1508338930, '369ed45d', 22, 0, 0)

Line : 187
File : sessions.php