The `x.nnz` should be `1` for for a nonzero scalar `x`, yet it is zero. MWE: ``` import numpy as np x = 1 + np.random.rand(5, 5) import sparse xs = sparse.COO.from_numpy(x) xs[1, 1] Out[6]: <COO: shape=(), dtype=float64, nnz=0, sorted=True, duplicates=False> ```