From d934e933812e2feb02f0f07f3d18278f12f559e1 Mon Sep 17 00:00:00 2001
From: Steven P <stevenpun04@gmail.com>
Date: Tue, 28 Jul 2026 13:45:08 -0700
Subject: [PATCH 1/2] Handle missing package version in module_available

---
 xarray/namedarray/utils.py |  3 +++
 xarray/tests/test_utils.py | 17 +++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/xarray/namedarray/utils.py b/xarray/namedarray/utils.py
index 3490a76aa8d..e4267637e17 100644
--- a/xarray/namedarray/utils.py
+++ b/xarray/namedarray/utils.py
@@ -60,6 +60,9 @@ def module_available(module: str, minversion: str | None = None) -> bool:
     if minversion is not None:
         version = importlib.metadata.version(module)
 
+        if version is None:
+            return False
+
         return Version(version) >= Version(minversion)
 
     return True
diff --git a/xarray/tests/test_utils.py b/xarray/tests/test_utils.py
index 90fdcb7d561..00a4997a9c3 100644
--- a/xarray/tests/test_utils.py
+++ b/xarray/tests/test_utils.py
@@ -2,6 +2,7 @@
 
 from collections.abc import Hashable
 from types import EllipsisType
+from unittest.mock import patch
 
 import numpy as np
 import pandas as pd
@@ -15,6 +16,7 @@
     infix_dims,
     iterate_nested,
 )
+from xarray.namedarray.utils import module_available
 from xarray.tests import assert_array_equal, requires_dask
 
 
@@ -390,6 +392,21 @@ def f():
 
     assert f() == 3
 
+# regression test
+def test_module_available_with_none_version() -> None:
+    module_available.cache_clear()
+
+    try:
+        with (
+            patch("importlib.util.find_spec", return_value=object()),
+            patch("importlib.metadata.version", return_value=None),
+        ):
+            assert not module_available(
+                "package_with_missing_version",
+                minversion="1.0",
+            )
+    finally:
+        module_available.cache_clear()
 
 def test_attempt_import() -> None:
     """Test optional dependency handling."""

From 1d21a255f30ada7a05a2e529bda7487a027a9e03 Mon Sep 17 00:00:00 2001
From: "pre-commit-ci[bot]"
 <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Date: Tue, 28 Jul 2026 20:48:30 +0000
Subject: [PATCH 2/2] [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci
---
 xarray/tests/test_utils.py | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/xarray/tests/test_utils.py b/xarray/tests/test_utils.py
index 00a4997a9c3..5bc2240ac8d 100644
--- a/xarray/tests/test_utils.py
+++ b/xarray/tests/test_utils.py
@@ -392,6 +392,7 @@ def f():
 
     assert f() == 3
 
+
 # regression test
 def test_module_available_with_none_version() -> None:
     module_available.cache_clear()
@@ -408,6 +409,7 @@ def test_module_available_with_none_version() -> None:
     finally:
         module_available.cache_clear()
 
+
 def test_attempt_import() -> None:
     """Test optional dependency handling."""
     np = attempt_import("numpy")