phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '42daf02f4f3f2033a2c16a7405e9c5d1' 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 ('42daf02f4f3f2033a2c16a7405e9c5d1', -1, 1771190684, 1771190684, 'd849d800', -4, 0, 0)

Line : 187
File : sessions.php