diff --git a/script/hassfest/mypy_config.py b/script/hassfest/mypy_config.py
index 54e5b5b13a7..9b03210e9eb 100644
--- a/script/hassfest/mypy_config.py
+++ b/script/hassfest/mypy_config.py
@@ -308,7 +308,9 @@ def generate_and_validate(config: Config) -> str:
                 "mypy_config", f"Only components should be added: {module}"
             )
         if module in ignored_modules_set:
-            config.add_error("mypy_config", f"Module '{module}' is in ignored list")
+            config.add_error(
+                "mypy_config", f"Module '{module}' is in ignored list in mypy_config.py"
+            )
 
     # Validate that all modules exist.
     all_modules = strict_modules + IGNORED_MODULES
@@ -326,6 +328,10 @@ def generate_and_validate(config: Config) -> str:
             if not module_path.is_file():
                 config.add_error("mypy_config", f"Module '{module} doesn't exist")
 
+    # Don't generate mypy.ini if there're errors found because it will likely crash.
+    if config.errors:
+        return ""
+
     mypy_config = configparser.ConfigParser()
 
     general_section = "mypy"
@@ -369,6 +375,9 @@ def validate(integrations: dict[str, Integration], config: Config) -> None:
     config_path = config.root / "mypy.ini"
     config.cache["mypy_config"] = content = generate_and_validate(config)
 
+    if config.errors:
+        return
+
     with open(str(config_path)) as fp:
         if fp.read().strip() != content:
             config.add_error(