Question: plots:-contourplot, division by zero for one contour line

Any explanation why this happens? notice, I did not supply the x and y ranges, let Maple decide.

restart;

interface(version);

`Standard Worksheet Interface, Maple 2026.1, Windows 10, April 28 2026 Build ID 2011354`

plots:-contourplot(y+sin(x),'colorbar'=false,':-contours' = 2,size=[100,100]);

plots:-contourplot(y+sin(x),'colorbar'=false,':-contours' = 1,size=[100,100]);

Error, (in plot/iplot2d) numeric exception: division by zero

 

 

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