diff --git a/plotly/shapeannotation.py b/plotly/shapeannotation.py
index a2323ed02d4..085b4fd8810 100644
--- a/plotly/shapeannotation.py
+++ b/plotly/shapeannotation.py
@@ -4,6 +4,9 @@
def _mean(x):
if len(x) == 0:
raise ValueError("x must have positive length")
+
+ if len(x) == 2 and x[0] == x[1]:
+ return x[0]
return float(sum(x)) / len(x)
diff --git a/tests/test_optional/test_autoshapes/test_annotated_shapes.py b/tests/test_optional/test_autoshapes/test_annotated_shapes.py
index 8d7c3806991..dfef857288b 100644
--- a/tests/test_optional/test_autoshapes/test_annotated_shapes.py
+++ b/tests/test_optional/test_autoshapes/test_annotated_shapes.py
@@ -52,6 +52,28 @@ def multi_plot_fixture():
return fig
+from datetime import datetime, timedelta
+
+
+def test_add_shape_with_dates():
+ start_date = datetime(2025, 1, 1)
+ end_date = datetime(2025, 10, 10)
+ dates = []
+ current_date = start_date
+ while current_date <= end_date:
+ dates.append(current_date.strftime("%Y-%m-%d"))
+ current_date += timedelta(weeks=4)
+ print(dates)
+ fig = go.Figure(
+ data=[go.Scatter(x=[x for x in range(1, 20, 2)], y=dates)],
+ layout=go.Layout(
+ title=go.layout.Title(text="A Figure Specified By A Graph Object")
+ ),
+ )
+ fig.add_vline(x="2025-06-24", annotation_text="test")
+ assert len(fig.layout.annotations) == 1
+
+
# Make sure adding a shape without specifying an annotation doesn't add any annotations
def test_add_shape_no_annotation(multi_plot_fixture):
multi_plot_fixture.add_hline(y=2, row="all", col="all")
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