So the annoying thing about character fields is that they have a limit.
When you try to save the row and the data is too long, it'll fail.
So to increase the limit, run this query:
1.
ALTER
TABLE
tablename
2.
ALTER
COLUMN
url TYPE
varchar
(500),
3.
ALTER
COLUMN
description TYPE
varchar
(300);
That's it! The fields url/description will now have the lengths of 500/300 respectively and maintain the original data.