diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
index 7034ea64c0d0..608ceaa99929 100644
--- a/lib/matplotlib/figure.py
+++ b/lib/matplotlib/figure.py
@@ -112,6 +112,8 @@ def add(self, key, a):
"""
Add Axes *a*, with key *key*, to the stack, and return the stack.
+ If *key* is unhashable, replace it by a unique, arbitrary object.
+
If *a* is already on the stack, don't add it again, but
return *None*.
"""
@@ -122,8 +124,7 @@ def add(self, key, a):
try:
hash(key)
except TypeError:
- raise ValueError(
- "first argument, {!r}, is not a valid key".format(key))
+ key = object()
a_existing = self.get(key)
if a_existing is not None:
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