diff --git a/src/css_reader.py b/src/css_reader.py
index e31d562..911594e 100644
--- a/src/css_reader.py
+++ b/src/css_reader.py
@@ -297,6 +297,7 @@ def add_inline_style_to_html_soup(soup1, css_text):
     html_with_inline_style = transform(str(soup1), css_text=css_text,
                                        remove_classes=False,
                                        external_styles=False,
+                                       allow_network=False,
                                        disable_validation=True)
     soup2 = BeautifulSoup(html_with_inline_style, features='lxml')
 
diff --git a/src/epub_postprocessor.py b/src/epub_postprocessor.py
index e550032..42e5f8d 100644
--- a/src/epub_postprocessor.py
+++ b/src/epub_postprocessor.py
@@ -188,6 +188,7 @@ class EpubPostprocessor:
         for i, file in enumerate(not_added):
             node = NavPoint(Section(f'To check #{i}, filename: {file}', file))
             self.adjacency_list[-1].append(node)
+            self.added_to_toc_hrefs.add(file)
 
     def unwrap_all_html_soup(self):
         # mark