The following SVG gives the error "prince: internal error: arc calculation error: denominator = zero":

<svg width="400.000000000000" height="250.000000000000" xmlns="http://www.w3.org/2000/svg" version="1.1" class="svg_pie_chart">
<g>
<g transform="translate(6.123233995736766e-16,10.0000000000000)">
<path d="M200.000000000000 115.000000000000 L200.000000000000 43.57142857142857 A71.42857142857143 71.42857142857143 0 1 1 199.99285714286904 43.57142892857142 z" stroke="black" fill="#F26444" stroke-width="1.00000000000000" class="svg_fill_series_2" />
</g>
<g transform="translate(6.123233995736766e-16,10.0000000000000)">
<path d="M200.000000000000 186.42857142857144 L200.000000000000 206.42857142857144" stroke="black" fill="none" stroke-width="1.00000000000000" />
</g>
</g>
</svg>

Thanks Ian, we will investigate this issue.

We have fixed this problem in Prince 5.1 rev 8, available for download today. Thanks for reporting the issue!