phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c46593ef398a9864d2b83a6cda956834' for key 'PRIMARY'

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c46593ef398a9864d2b83a6cda956834', -1, 1414223141, 1414223141, '36ea0055', 3, 0, 0)

Line : 187
File : sessions.php