del cursor after cursor.close() raises exception

When deleting a cursor via del cursor and the cursor was closed before, an exception will be thrown:

>>> import mariadb
>>> c=mariadb.connect()
>>> cursor=c.cursor()
>>> cursor.close()
>>> del cursor
Exception ignored in: <function Cursor._del_ at 0x7ff0136b8ee0>
mariadb.ProgrammingError: Cursor is closed

Same issue was reported on Stackoverflow