phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c136e05da7a51ef8dec0f19545cf2a86' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('c136e05da7a51ef8dec0f19545cf2a86', -1, 1771858361, 1771858361, '2d971ed8', -9, 0, 0)

Line : 187
File : sessions.php