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polar_plot((1/sin(theta)),(theta, pi/12, pi/2))

In Sage notebook v 4.6.1 I wrote:

var('theta')
polar_plot((1/sin(theta)),(theta, pi/12, pi/2))

I got

libpng error: Image width or height is zero in IHDR
Traceback (click to the left of this block for traceback)
...
RuntimeError: Error building image

What am I doing wrong?