phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dc4991c92342989b2bb6629661f2a954' 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 ('dc4991c92342989b2bb6629661f2a954', -1, 1770157634, 1770157634, 'd849d8a2', -4, 0, 0)

Line : 187
File : sessions.php