Errors in cmd after making script

Do you know what mistake is it and how to get rid of it??

In command line I print:

blender -b -P -- 0

and then script works right, but in cmd:

Error: Not freed memory blocks: 14
wmOperatorReportList len : 40 0000000003FCF028
(13 wmOperator-s or more if script is larger)

Blender quit