phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5c4d770dc1a838c0bde62b5c251f0f06' 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 ('5c4d770dc1a838c0bde62b5c251f0f06', -1, 1769835685, 1769835685, 'd849d851', -4, 0, 0)

Line : 187
File : sessions.php