phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '8b4c1e9a4462fe8b039cf0d2d46f9f88' 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 ('8b4c1e9a4462fe8b039cf0d2d46f9f88', -1, 1766154259, 1766154259, 'd849d819', 12, 0, 0)

Line : 187
File : sessions.php