matplotlib
diff --git a/‎lib/matplotlib/backends/backend_pdf.py
+3 b/‎lib/matplotlib/backends/backend_pdf.py
+3
diff --git a/‎lib/matplotlib/backends/backend_svg.py
+1-1 b/‎lib/matplotlib/backends/backend_svg.py
+1-1
diff --git a/‎lib/matplotlib/tests/baseline_images/test_axes/contour_hatching.pdf
82 KB b/‎lib/matplotlib/tests/baseline_images/test_axes/contour_hatching.pdf
82 KB
diff --git a/‎lib/matplotlib/tests/baseline_images/test_axes/contour_hatching.png
57.2 KB b/‎lib/matplotlib/tests/baseline_images/test_axes/contour_hatching.png
57.2 KB
@@ -1057,6 +1057,9 @@ def alphaState(self, alpha):
         return name
 
     def hatchPattern(self, hatch_style):
+        # The colors may come in as numpy arrays, which aren't hashable
+        hatch_style = (tuple(hatch_style[0]), tuple(hatch_style[1]), hatch_style[2])
+
         pattern = self.hatchPatterns.get(hatch_style, None)
         if pattern is not None:
             return pattern
 
@@ -327,7 +327,7 @@ def _get_hatch(self, gc, rgbFace):
         """
         Create a new hatch pattern
         """
-        dictkey = (gc.get_hatch(), rgbFace, gc.get_rgb())
+        dictkey = (gc.get_hatch(), tuple(rgbFace), tuple(gc.get_rgb()))
         oid = self._hatchd.get(dictkey)
         if oid is None:
             oid = self._make_id(u'h', dictkey)