phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1114 The table 'phpbb_sessions' is full

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('0d998cb0e9d3c234c9f8e864953f2021', -1, 1513108074, 1513108074, '36dd49ba', 0, 0, 0)

Line : 187
File : sessions.php