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 ('4ba1065de6b55c2290b9f459ddb5e9c0', -1, 1527413642, 1527413642, '36a7d8ef', 18, 0, 0)

Line : 187
File : sessions.php