Let me make clearer how I reproduce this. This is one repeatable method:

1) Launch Inkscape 0.91 to a blank page.

2) Open a drawing I had already created.

3) Paste an image onto the page. In my case, I copied an image our of a web page viewed in Firefox.

4) Observe crash.

Alternately

1) Launch Inkscape 0.91 to a blank page.
2) Paste an image onto the blank page. In my case, I copied an image our of a web page viewed in Firefox.

3) Open a pre-existing drawing.

4) Observe crash.

Cheers,

Steve