phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '73d5e2463735d4d6d17160f892ecd2c7' 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 ('73d5e2463735d4d6d17160f892ecd2c7', -1, 1770504100, 1770504100, 'd849d897', -4, 0, 0)

Line : 187
File : sessions.php