From 66b52a2cf766aef5dba010afa85531bb94333a41 Mon Sep 17 00:00:00 2001
From: Mark Byrne <mbyrnepr2@gmail.com>
Date: Tue, 3 Oct 2023 14:26:35 +0200
Subject: [PATCH] Fix a crash when an enum class which is also decorated with a
 ``dataclasses.dataclass`` decorator is defined.

Closes #9100
---
 doc/whatsnew/fragments/9100.other                         | 3 +++
 pylint/checkers/utils.py                                  | 5 ++++-
 .../i/invalid/invalid_name/invalid_name_enum.py           | 8 +++++++-
 .../i/invalid/invalid_name/invalid_name_enum.txt          | 2 +-
 4 files changed, 15 insertions(+), 3 deletions(-)
 create mode 100644 doc/whatsnew/fragments/9100.other

diff --git a/doc/whatsnew/fragments/9100.other b/doc/whatsnew/fragments/9100.other
new file mode 100644
index 00000000000..75e19175b9c
--- /dev/null
+++ b/doc/whatsnew/fragments/9100.other
@@ -0,0 +1,3 @@
+Fix a crash when an enum class which is also decorated with a ``dataclasses.dataclass`` decorator is defined.
+
+Closes #9100
diff --git a/pylint/checkers/utils.py b/pylint/checkers/utils.py
index d3a344c9c63..370e7fe20da 100644
--- a/pylint/checkers/utils.py
+++ b/pylint/checkers/utils.py
@@ -2281,5 +2281,8 @@ def is_enum_member(node: nodes.AssignName) -> bool:
     ):
         return False
 
-    enum_member_objects = frame.locals.get("__members__")[0].items
+    try:
+        enum_member_objects = frame.locals.get("__members__")[0].items
+    except TypeError:
+        return False
     return node.name in [name_obj.name for value, name_obj in enum_member_objects]
diff --git a/tests/functional/i/invalid/invalid_name/invalid_name_enum.py b/tests/functional/i/invalid/invalid_name/invalid_name_enum.py
index 5338a036931..055883f1223 100644
--- a/tests/functional/i/invalid/invalid_name/invalid_name_enum.py
+++ b/tests/functional/i/invalid/invalid_name/invalid_name_enum.py
@@ -1,7 +1,8 @@
 """ Tests for invalid-name checker in the context of enums. """
-# pylint: disable=too-few-public-methods
+# pylint: disable=too-few-public-methods, missing-class-docstring
 
 
+from dataclasses import dataclass
 from enum import Enum
 
 
@@ -28,3 +29,8 @@ def __init__(self, red: int, green: int, blue: int) -> None:
     def as_hex(self) -> str:
         """Get hex 'abcdef' representation for a color."""
         return f'{self.red:0{2}x}{self.green:0{2}x}{self.blue:0{2}x}'
+
+
+@dataclass
+class Something(str, Enum):
+    asd: str = 'sdf'
diff --git a/tests/functional/i/invalid/invalid_name/invalid_name_enum.txt b/tests/functional/i/invalid/invalid_name/invalid_name_enum.txt
index 9383a49dbff..97f29cc6277 100644
--- a/tests/functional/i/invalid/invalid_name/invalid_name_enum.txt
+++ b/tests/functional/i/invalid/invalid_name/invalid_name_enum.txt
@@ -1 +1 @@
-invalid-name:16:4:16:14:Color:"Class constant name ""aquamarine"" doesn't conform to UPPER_CASE naming style":HIGH
+invalid-name:17:4:17:14:Color:"Class constant name ""aquamarine"" doesn't conform to UPPER_CASE naming style":HIGH