phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '7271f9e81e3a87d9656b686330148e87' 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 ('7271f9e81e3a87d9656b686330148e87', -1, 1498578626, 1498578626, '3691607a', 3, 0, 0)

Line : 187
File : sessions.php