phpBB : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('ad302608f9fa78b8ea9b2f618fb2b05a', -1, 1540032152, 1540032152, '36e0f72a', 27, 0, 0)

Line : 187
File : sessions.php

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