phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '977a9aa503cd9c03e19ebcfe2dd4e6b8' 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 ('977a9aa503cd9c03e19ebcfe2dd4e6b8', -1, 1780582485, 1780582485, 'c0a81011', 2, 0, 0)

Line : 187
File : sessions.php