phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'ac50eb1bfffcccb5451d85564d8a0c2b' 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 ('ac50eb1bfffcccb5451d85564d8a0c2b', -1, 1714286617, 1714286617, '0315e7f5', 0, 0, 0)

Line : 187
File : sessions.php