Null is not a subject

While I solve a problem it turns white with a red box on top saying “null is not a subject”.

Hi AHumanInLife,

I'm not able to reproduce this issue from my end---can you provide a detailed list of steps that you took to arrive at this issue? A link to the relevant page and a screenshot of the issue would also be very helpful.

Thanks!

First, it was okay and I was doing a math question. When I was done with the question, I clicked the check button. It turned white (not the whole screen) and had a red rectangle-box thing, that said something like “Null is not a subject, please refresh if this keep happening, tell us.” When I refreshed, it put me back on my course page. I tried again and re-do the question, it worked for while but the “Null is not a subject” came up again. Then the process keep going on and on.

Thanks for the additional info!

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Ok thanks