phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4a7b1795bba0e76bbd7fa7d20dcaa77a' 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 ('4a7b1795bba0e76bbd7fa7d20dcaa77a', -1, 1767098307, 1767098307, 'd849d819', -9, 0, 0)

Line : 187
File : sessions.php