phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '0c4a3017470e0c1af723f59306a0204b' 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 ('0c4a3017470e0c1af723f59306a0204b', -1, 1770557605, 1770557605, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php