phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b1a16b4cb7a401cc9af09cf7e11dc7d5' for key 'PRIMARY'

INSERT INTO fl_phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b1a16b4cb7a401cc9af09cf7e11dc7d5', -1, 1768467361, 1768467361, 'd849d867', 5, 0, 0)

Line : 187
File : sessions.php