phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b12decb6638059222cea04d72fe3c39d' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b12decb6638059222cea04d72fe3c39d', -1, 1781500063, 1781500063, '00000000', -501, 0, 0)

Line : 187
File : sessions.php