matplotlib
diff --git a/‎lib/matplotlib/backend_bases.py
Lines changed: 4 additions & 0 deletions b/‎lib/matplotlib/backend_bases.py
Lines changed: 4 additions & 0 deletions
diff --git a/‎lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.pdf
7 KB b/‎lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.pdf
7 KB
diff --git a/‎lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.png
50.6 KB b/‎lib/matplotlib/tests/baseline_images/test_artist/clip_path_clipping.png
50.6 KB
@@ -898,6 +898,10 @@ def set_dashes(self, dash_offset, dash_list):
             ``(None, None)`` specifies a solid line
 
         """
+        if dash_list is not None:
+            dl = np.asarray(dash_list)
+            if np.any(dl <= 0.0):
+                raise ValueError("All values in the dash list must be positive")
         self._dashes = dash_offset, dash_list
 
     def set_foreground(self, fg, isRGBA=False):