diff --git a/tools/idf_py_actions/hint_modules/component_requirements.py b/tools/idf_py_actions/hint_modules/component_requirements.py
index 04d1675a99..92e3a66825 100644
--- a/tools/idf_py_actions/hint_modules/component_requirements.py
+++ b/tools/idf_py_actions/hint_modules/component_requirements.py
@@ -1,4 +1,4 @@
-# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-FileCopyrightText: 2023-2024 Espressif Systems (Shanghai) CO LTD
 # SPDX-License-Identifier: Apache-2.0
 import os
 import re
@@ -27,6 +27,10 @@ ENOENT_FULL_RE = re.compile(r'^(In file included.*No such file or directory)$',
 ORIGINAL_FILE_RE = re.compile(r'.*from (.*):[\d]+:')
 
 
+def _bug(msg: str) -> str:
+    return f'BUG: {os.path.basename(__file__)}: {msg}'
+
+
 def _get_absolute_path(filename: str, base: str) -> str:
     # If filename path is relative, return absolute path based
     # on base directory. The filename is normalized in any case.
@@ -74,13 +78,14 @@ def generate_hint(output: str) -> Optional[str]:
         # we can't help much.
         return None
 
-    # find the original_component, which may be different from sourc_component
+    # find the original_component, which may be different from source_component
     found_original_component_name = found_source_component_name
     found_original_component_info = found_source_component_info
     original_filename = source_filename
     hint_match_full = ENOENT_FULL_RE.search(output)
     if hint_match_full:
-        lines = hint_match_full.group().splitlines()
+        # As a precaution remove empty lines, but there should be none.
+        lines = [line for line in hint_match_full.group().splitlines() if line]
         # second line from the end contains filename which is part of the
         # original_component
         original_file_match = ORIGINAL_FILE_RE.match(lines[-2])
@@ -92,11 +97,19 @@ def generate_hint(output: str) -> Optional[str]:
                     found_original_component_name = component_name
                     found_original_component_info = component_info
                     break
+            else:
+                # Original component not found. This should never happen, because the
+                # original_filename has to part of some component, which was added to
+                # the build.
+                return _bug((f'cannot find original component for source '
+                             f'component {found_source_component_name}'))
+
         else:
             # We should never reach this path. It would probably mean
-            # the preprocessor output was changed. Anyway we can still
-            # report something meaningful, so just keep going.
-            pass
+            # the preprocessor output was changed or we received malformed
+            # output.
+            return _bug((f'cannot match original component filename for '
+                         f'source component {found_source_component_name}'))
 
     # look for the header file in the public include directories of all components
     found_dep_component_names = []
@@ -154,7 +167,8 @@ def generate_hint(output: str) -> Optional[str]:
         if dep_component_name in all_reqs:
             # Oops. This component is already in the requirements list.
             # How did this happen?
-            return f'BUG: {missing_header} found in component {dep_component_name} which is already in the requirements list of {found_source_component_name}'
+            return _bug((f'{missing_header} found in component {dep_component_name} '
+                         f'which is already in the requirements list of {found_source_component_name}'))
 
     # try to figure out the correct require type: REQUIRES or PRIV_REQUIRES
     requires_type = None
diff --git a/tools/test_idf_py/test_hints.py b/tools/test_idf_py/test_hints.py
index faa0b82a3e..393c48d67e 100755
--- a/tools/test_idf_py/test_hints.py
+++ b/tools/test_idf_py/test_hints.py
@@ -149,7 +149,7 @@ class TestNestedModuleComponentRequirements(unittest.TestCase):
         self.projectdir.mkdir(parents=True)
         (self.projectdir / 'CMakeLists.txt').write_text((
             'cmake_minimum_required(VERSION 3.16)\n'
-            f'set(EXTRA_COMPONENT_DIRS "{components}")\n'
+            f'set(EXTRA_COMPONENT_DIRS "{components.as_posix()}")\n'
             'set(COMPONENTS main)\n'
             'include($ENV{IDF_PATH}/tools/cmake/project.cmake)\n'
             'project(foo)'))
@@ -164,7 +164,7 @@ class TestNestedModuleComponentRequirements(unittest.TestCase):
         # when components are nested. The main component should be identified as the
         # real source, not the component1 component.
         output = run_idf(['app'], self.projectdir)
-        self.assertNotIn('BUG: esp_timer.h found in component esp_timer which is already in the requirements list of component1', output)
+        self.assertNotIn('esp_timer.h found in component esp_timer which is already in the requirements list of component1', output)
         self.assertIn('To fix this, add esp_timer to PRIV_REQUIRES list of idf_component_register call', output)
 
     def tearDown(self) -> None: