phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '73f6db0ce978e6fb722587d3191e82a7' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('73f6db0ce978e6fb722587d3191e82a7', -1, 1409136671, 1409136671, '32134623', -1, 0, 0)

Line : 187
File : sessions.php