User blog comment:Alemagno12/Yet another bug/@comment-3427444-20160709060422

I reproduced the above by attempting to create a page called "User:Cloudy176/What?/Attempting to create a page whose title ends with a forward slash/":

The page you wanted to save was blocked by the spam filter.

This is probably caused by a blacklisted link or pagename.

Block ID #8042

The following link, text or pagename is what triggered our spam filter: /

If you think this is wrong, please contact us here. Please, provide a copy of this message when reporting any problem.

The text was found in the page's summary.

Return to User:Cloudy176/What?/Attempting to create a page whose title ends with a forward slash/.

So next time, remove the forward slash at the end of the title.