phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('04d0f42327c739400e1b4d2bb9083e9f', -1, 1496128084, 1496128084, '36a7fe4e', 1, 0)

Line : 158
File : sessions.php