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 ('3f03f7fcee84c16ac3a7ba1e61d5719f', -1, 1511502779, 1511502779, '36c68620', 15, 0, 0)

Line : 187
File : sessions.php