Errors in cmd after making script

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

In command line I print:


blender -b -P startup.py -- 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