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 ('87191dff7a40ddefb71a34570c7fdfd4', -1, 1475149695, 1475149695, '36f25307', -1, 0, 0)

Line : 187
File : sessions.php