phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '5a94985b44ee0f14c79e761fe3fd8b62' 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 ('5a94985b44ee0f14c79e761fe3fd8b62', -1, 1508678989, 1508678989, '365c8dd3', -4, 0, 0)

Line : 187
File : sessions.php