From e6dd37b15d7c19a5c18dbc0678d4e79486a24966 Mon Sep 17 00:00:00 2001
From: Tim Hoffmann <2836374+timhoffm@users.noreply.github.com>
Date: Thu, 13 Oct 2022 12:40:51 +0200
Subject: [PATCH] Backport PR #24149: FIX: handle input to ax.bar that is all
 nan

---
 lib/matplotlib/axes/_axes.py      |  8 ++++++++
 lib/matplotlib/tests/test_axes.py | 13 +++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index e5e34c91257d..d8ac2bb829f3 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -2182,11 +2182,19 @@ def _convert_dx(dx, x0, xconv, convert):
                 x0 = cbook._safe_first_finite(x0)
             except (TypeError, IndexError, KeyError):
                 pass
+            except StopIteration:
+                # this means we found no finite element, fall back to first
+                # element unconditionally
+                x0 = cbook.safe_first_element(x0)
 
             try:
                 x = cbook._safe_first_finite(xconv)
             except (TypeError, IndexError, KeyError):
                 x = xconv
+            except StopIteration:
+                # this means we found no finite element, fall back to first
+                # element unconditionally
+                x = cbook.safe_first_element(xconv)
 
             delist = False
             if not np.iterable(dx):
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index d6d44bcdb283..c238009b0be1 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -8144,3 +8144,16 @@ def test_bar_leading_nan():
         for b in rest:
             assert np.isfinite(b.xy).all()
             assert np.isfinite(b.get_width())
+
+
+@check_figures_equal(extensions=["png"])
+def test_bar_all_nan(fig_test, fig_ref):
+    mpl.style.use("mpl20")
+    ax_test = fig_test.subplots()
+    ax_ref = fig_ref.subplots()
+
+    ax_test.bar([np.nan], [np.nan])
+    ax_test.bar([1], [1])
+
+    ax_ref.bar([1], [1]).remove()
+    ax_ref.bar([1], [1])