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null pointer passed as argument 1

You forgot to include the relevant code. You probably call your check function with a NULL pointer. This might happen for example if you use argv[1] before checking whether argc is greater than 1 (or ...
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1 vote

cs50 pset4 blur function index out of bounds issue

Some of your conditions need to change. There's no 'between' syntax like in maths, so (0 < j < width-1) won't work in c. You need to split this into something like (j > 0 && j < ...
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