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 ('6fa87e4ac0e8aab04061f0f6235cb6c4', -1, 1511502855, 1511502855, '36c68620', -4, 0, 0)

Line : 187
File : sessions.php