diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 512b12d32d32..0b97242c91a5 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -4,7 +4,6 @@
import six
from six.moves import xrange, zip, zip_longest
-from collections import Sized
import functools
import itertools
import math
@@ -3025,8 +3024,7 @@ def extract_err(err, data):
# special case for empty lists
if len(err) > 1:
fe = safe_first_element(err)
- if (len(err) != len(data)
- or isinstance(fe, Sized) and len(fe) > 1):
+ if (len(err) != len(data) or np.size(fe) > 1):
raise ValueError("err must be [ scalar | N, Nx1 "
"or 2xN array-like ]")
# using list comps rather than arrays to preserve units
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