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 ('5d0a9850aa26cb2cee41bd34b19e525c', -1, 1475198903, 1475198903, '7f000001', -9, 0, 0)

Line : 187
File : sessions.php