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 ('ced48957ffa6b1c65fc3e53676b8a3b8', -1, 1511368138, 1511368138, '36c6dd0d', 4, 0, 0)

Line : 187
File : sessions.php