diff --git a/docsrc/source/index.rst b/docsrc/source/index.rst
index c0bffadb6..1ad1be324 100644
--- a/docsrc/source/index.rst
+++ b/docsrc/source/index.rst
@@ -24,7 +24,7 @@
    pages/use_cases/custom_report_appearance
 
 .. toctree::
-    :maxdepth: 3
+   :maxdepth: 3
    :caption: Data Catalog with Profiling (Self-hosted)
    :hidden:
 
@@ -38,7 +38,7 @@
 
    pages/integrations/other_dataframe_libraries
    pages/integrations/great_expectations
-    pages/integrations/bytewax
+   pages/integrations/bytewax
    pages/integrations/data_apps
    pages/integrations/pipelines
    pages/integrations/cloud_services
diff --git a/src/ydata_profiling/report/structure/variables/render_categorical.py b/src/ydata_profiling/report/structure/variables/render_categorical.py
index 0ef2aa04a..cc926ac60 100644
--- a/src/ydata_profiling/report/structure/variables/render_categorical.py
+++ b/src/ydata_profiling/report/structure/variables/render_categorical.py
@@ -136,6 +136,8 @@ def render_categorical_unicode(
     for category_alias_name, category_alias_counts in sorted(
         summary["category_alias_char_counts"].items(), key=lambda x: -len(x[1])
     ):
+        if category_alias_name is None:
+            continue
         category_alias_name = category_alias_name.replace("_", " ")
         cats.append(
             FrequencyTable(