phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5da28b8b06910ce44faae06297656b51' 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 ('5da28b8b06910ce44faae06297656b51', -1, 1429327329, 1429327329, 'adf536aa', 15, 0, 0)

Line : 245
File : sessions.php