phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7878a24084f0be57db107586579dbe3a' 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 ('7878a24084f0be57db107586579dbe3a', -1, 1788999061, 1788999061, 'd849d8cc', 2, 0, 0)

Line : 187
File : sessions.php