diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 40e48fd5512f..a4afe5e83fdc 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -2138,12 +2138,12 @@ def _convert_dx(dx, x0, xconv, convert):
# removes the units from unit packages like `pint` that
# wrap numpy arrays.
try:
- x0 = x0[0]
+ x0 = cbook.safe_first_element(x0)
except (TypeError, IndexError, KeyError):
x0 = x0
try:
- x = xconv[0]
+ x = cbook.safe_first_element(xconv)
except (TypeError, IndexError, KeyError):
x = xconv
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index 01110ae26855..7830cde5f50d 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -1647,6 +1647,14 @@ def test_bar_pandas(pd):
ax.plot(dates, baseline, color='orange', lw=4)
+def test_bar_pandas_indexed(pd):
+ # Smoke test for indexed pandas
+ df = pd.DataFrame({"x": [1., 2., 3.], "width": [.2, .4, .6]},
+ index=[1, 2, 3])
+ fig, ax = plt.subplots()
+ ax.bar(df.x, 1., width=df.width)
+
+
@image_comparison(['hist_log'], remove_text=True)
def test_hist_log():
data0 = np.linspace(0, 1, 200)**3
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