diff --git a/CHANGES b/CHANGES
index 3724c65cab3..d0e4e6316cc 100644
--- a/CHANGES
+++ b/CHANGES
@@ -37,6 +37,7 @@ Features added
 Bugs fixed
 ----------
 
+* #8074: napoleon: Crashes during processing C-ext module
 * #8084: autodoc: KeyError is raised on documenting an attribute of the broken
   class
 
diff --git a/sphinx/ext/napoleon/docstring.py b/sphinx/ext/napoleon/docstring.py
index 52abf975339..29799cb06c3 100644
--- a/sphinx/ext/napoleon/docstring.py
+++ b/sphinx/ext/napoleon/docstring.py
@@ -1074,7 +1074,10 @@ def __init__(self, docstring: Union[str, List[str]], config: SphinxConfig = None
         super().__init__(docstring, config, app, what, name, obj, options)
 
     def _get_location(self) -> str:
-        filepath = inspect.getfile(self._obj) if self._obj is not None else None
+        try:
+            filepath = inspect.getfile(self._obj) if self._obj is not None else None
+        except TypeError:
+            filepath = None
         name = self._name
 
         if filepath is None and name is None:
diff --git a/sphinx/registry.py b/sphinx/registry.py
index 0aec0a9fd0c..4d1e9eb7246 100644
--- a/sphinx/registry.py
+++ b/sphinx/registry.py
@@ -367,7 +367,14 @@ def add_js_file(self, filename: str, **attributes: str) -> None:
         logger.debug('[app] adding js_file: %r, %r', filename, attributes)
         self.js_files.append((filename, attributes))
 
+    def has_latex_package(self, name: str) -> bool:
+        packages = self.latex_packages + self.latex_packages_after_hyperref
+        return bool([x for x in packages if x[0] == name])
+
     def add_latex_package(self, name: str, options: str, after_hyperref: bool = False) -> None:
+        if self.has_latex_package(name):
+            logger.warn("latex package '%s' already included" % name)
+
         logger.debug('[app] adding latex package: %r', name)
         if after_hyperref:
             self.latex_packages_after_hyperref.append((name, options))
diff --git a/sphinx/util/template.py b/sphinx/util/template.py
index 18047d68758..bb078a2a246 100644
--- a/sphinx/util/template.py
+++ b/sphinx/util/template.py
@@ -84,6 +84,8 @@ def __init__(self, template_path: str = None, latex_engine: str = None) -> None:
         self.env.variable_end_string = '%>'
         self.env.block_start_string = '<%'
         self.env.block_end_string = '%>'
+        self.env.comment_start_string = '<#'
+        self.env.comment_end_string = '<#'
 
 
 class ReSTRenderer(SphinxRenderer):