phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c1ab0ae735f3e7298b6f4bf1d066868d' 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 ('c1ab0ae735f3e7298b6f4bf1d066868d', -1, 1770651599, 1770651599, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php