phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '78c514f9835b696c084c4b6c368598d0' 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 ('78c514f9835b696c084c4b6c368598d0', -1, 1770766919, 1770766919, 'd849d88f', -4, 0, 0)

Line : 187
File : sessions.php