phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4376fd33955f0953e4e979325e2046e3' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('4376fd33955f0953e4e979325e2046e3', -1, 1418891762, 1418891762, '365759b0', -1, 0, 0)

Line : 187
File : sessions.php