diff --git a/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/Classifier.cs b/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/Classifier.cs
index cd88709..9108dae 100644
--- a/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/Classifier.cs
+++ b/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/Classifier.cs
@@ -23,7 +23,7 @@ public async Task<IEnumerable<Range>> Classify(Document document, SourceText tex
             catch (Exception ex)
             {
                 Log.Exception(ex, "Exception during Classification of document: " + document.FilePath);
-                return null;
+                return Array.Empty<Range>();
             }
 
             // Roslyn 3.0.0 introduced `Symbol - Static` as an "additive" classification, meaning that multiple
diff --git a/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/DocumentGenerator.cs b/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/DocumentGenerator.cs
index 7259000..29db160 100644
--- a/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/DocumentGenerator.cs
+++ b/src/SourceBrowser/src/HtmlGenerator/Pass1-Generation/DocumentGenerator.cs
@@ -151,7 +151,7 @@ private async Task GenerateHtml(StreamWriter writer)
             writer.Write(prefix);
             GenerateHeader(writer.WriteLine);
 
-            var ranges = (await classifier.Classify(Document, Text)).ToArray();
+            var ranges = (await classifier.Classify(Document, Text))?.ToArray();
 
             // pass a value larger than 0 to generate line numbers statically at HTML generation time
             var table = Markup.GetTablePrefix(