phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '494c9d5ec7f2724cdcd3459f97b813b6' 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 ('494c9d5ec7f2724cdcd3459f97b813b6', -1, 1769109041, 1769109041, '12610e50', -1, 0, 0)

Line : 187
File : sessions.php