From f7590a2e480a5613546bef42f0f044e279c32cf6 Mon Sep 17 00:00:00 2001
From: Manuel Goacolou <mgoacolou@cls.fr>
Date: Thu, 20 Jun 2019 10:25:49 +0200
Subject: [PATCH] use only hashable objects

---
 lib/matplotlib/figure.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
index 2896a2477ddd..43db5c68e371 100644
--- a/lib/matplotlib/figure.py
+++ b/lib/matplotlib/figure.py
@@ -1072,6 +1072,11 @@ def fixitems(items):
             # to tuples for the key
             ret = []
             for k, v in items:
+                # some objects are not hashable: skip them
+                try:
+                    hash(v)
+                except Exception:
+                    continue
                 # some objects can define __getitem__ without being
                 # iterable and in those cases the conversion to tuples
                 # will fail. So instead of using the np.iterable(v) function