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 ('f7ba9e8b0c5660fd557f5183e7ee8380', -1, 1505957661, 1505957661, '36a2dad6', 15, 0, 0)

Line : 187
File : sessions.php