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If the form generates an invalid target page name, then

 $target_title = Title::newFromText( preg_replace( '/{num.*}/', $title_number, $targetName ) );

in SF_AutoeditAPI::generateTargetName() (line 677) will return null, which will result in a fatal error (Call to a member function on a non-object) in the following loop.

Solution: Throw an error ("Invalid target page name $name") if Title::newFromText() returns null.