phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c1bff84d6843786a16e5a4b0f96192e7' 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 ('c1bff84d6843786a16e5a4b0f96192e7', -1, 1741081113, 1741081113, '12bfc815', 0, 0, 0)

Line : 187
File : sessions.php