phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b2c4c1f0aceeedc2ff74910f5cf93520' 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 ('b2c4c1f0aceeedc2ff74910f5cf93520', -1, 1768685031, 1768685031, 'd849d879', -4, 0, 0)

Line : 187
File : sessions.php