Vertical alignment of image within <td> crashes

If I use RichText in a QML Text object, and place the following text into it:

<table><tr><td/><td valign="top"><img src="x.png"></td></tr></table>

where x.png is any image file, it crashes. The requirements for the crash are:

• It must be an image. It doesn't crash if the file doesn't exist.
• It must be within a <td>
• It must be in the second or later table column (hence the <td/>).
• It must either have a valign="top" attribute or be styled with vertical-align: top, or the equivalent bottom; the default middle is okay.