diff --git a/src/Serilog.Extensions.Logging/Extensions/Logging/LoggerProviderCollectionSink.cs b/src/Serilog.Extensions.Logging/Extensions/Logging/LoggerProviderCollectionSink.cs
index 2a3a586..0febb52 100644
--- a/src/Serilog.Extensions.Logging/Extensions/Logging/LoggerProviderCollectionSink.cs
+++ b/src/Serilog.Extensions.Logging/Extensions/Logging/LoggerProviderCollectionSink.cs
@@ -29,7 +29,7 @@ public LoggerProviderCollectionSink(LoggerProviderCollection providers)
 
     public void Emit(LogEvent logEvent)
     {
-        string? categoryName = null;
+        string categoryName = "None";
         EventId eventId = default;
 
         if (logEvent.Properties.TryGetValue("SourceContext", out var sourceContextProperty) &&