phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c2c42c9b53673e86b93e8587d7f1bf6a' 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 ('c2c42c9b53673e86b93e8587d7f1bf6a', -1, 1778537573, 1778537573, 'd849d8ac', -4, 0, 0)

Line : 187
File : sessions.php