phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c1cdc39b793ed00b041500423b55f548' 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 ('c1cdc39b793ed00b041500423b55f548', -1, 1768278914, 1768278914, 'd849d81c', -4, 0, 0)

Line : 187
File : sessions.php