[TYPO3-english] MySql error Column 'originalfilesha1' cannot be null

[ian excedo]

Using TYPO3 6.2 whit Bootstrap Package I also use this online tool http://mattkersley.com/responsive/ to test responsive design.

When I refresh with SHIFT+F5 and logged in administrator in BE, I often get this MySql error in 1 or 2 Iframe of the tool:
ERROR	Column 'originalfilesha1' cannot be null

My guess is that when a non-cached page is hit quickly many times then there is a problem in the generation of some filenames.
Maybe this could be a problem for sites with high traffic.

Can someone else reproduce this?
Thanks!