diff --git a/lib/mpl_toolkits/mplot3d/art3d.py b/lib/mpl_toolkits/mplot3d/art3d.py
index 0888853df37e..a41485f62529 100644
--- a/lib/mpl_toolkits/mplot3d/art3d.py
+++ b/lib/mpl_toolkits/mplot3d/art3d.py
@@ -905,7 +905,7 @@ def __init__(self, verts, *args, zsort='average', shade=False,
kwargs['edgecolors'] = _shade_colors(
edgecolors, normals, lightsource
)
- if facecolors is None and edgecolors in None:
+ if facecolors is None and edgecolors is None:
raise ValueError(
"You must provide facecolors, edgecolors, or both for "
"shade to work.")
diff --git a/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py b/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py
index 644e2f245812..1f8764cbab9d 100644
--- a/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py
+++ b/lib/mpl_toolkits/mplot3d/tests/test_axes3d.py
@@ -2260,3 +2260,13 @@ def test_surface3d_zsort_inf():
ax.plot_surface(x, y, z, cmap='jet')
ax.view_init(elev=45, azim=145)
+
+
+def test_Poly3DCollection_init_value_error():
+ # smoke test to ensure the input check works
+ # GH#26420
+ with pytest.raises(ValueError,
+ match='You must provide facecolors, edgecolors, '
+ 'or both for shade to work.'):
+ poly = np.array([[0, 0, 1], [0, 1, 1], [0, 0, 0]], float)
+ c = art3d.Poly3DCollection([poly], shade=True)
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