phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a56dd5de28544ee8ff2b2b7e3c1de896' 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 ('a56dd5de28544ee8ff2b2b7e3c1de896', -1, 1767835202, 1767835202, 'd849d887', 4, 0, 0)

Line : 187
File : sessions.php