diff --git a/CHANGES.md b/CHANGES.md
index 72b8da47..0bd08f88 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,6 @@
+# 9.0.2
+* Fixed issue #643: TraceId and SpanId are saved as empty string instead of NULL (thanks to @nanny07)
+
 # 9.0.1
 * Fixed issue #642: NuGet package downgrade System.Configuration.ConfigurationManager error
 * Updated sample apps to .NET 9
diff --git a/src/Serilog.Sinks.MSSqlServer/Serilog.Sinks.MSSqlServer.csproj b/src/Serilog.Sinks.MSSqlServer/Serilog.Sinks.MSSqlServer.csproj
index babe262a..8240a56b 100644
--- a/src/Serilog.Sinks.MSSqlServer/Serilog.Sinks.MSSqlServer.csproj
+++ b/src/Serilog.Sinks.MSSqlServer/Serilog.Sinks.MSSqlServer.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <Description>A Serilog sink that writes events to Microsoft SQL Server and Azure SQL</Description>
-    <VersionPrefix>9.0.1</VersionPrefix>
+    <VersionPrefix>9.0.2</VersionPrefix>
     <EnablePackageValidation>true</EnablePackageValidation>
     <PackageValidationBaselineVersion>9.0.0</PackageValidationBaselineVersion>
     <Authors>Michiel van Oudheusden;Christian Kadluba;Serilog Contributors</Authors>
diff --git a/src/Serilog.Sinks.MSSqlServer/Sinks/MSSqlServer/Output/StandardColumnDataGenerator.cs b/src/Serilog.Sinks.MSSqlServer/Sinks/MSSqlServer/Output/StandardColumnDataGenerator.cs
index 2766504b..435dc741 100644
--- a/src/Serilog.Sinks.MSSqlServer/Sinks/MSSqlServer/Output/StandardColumnDataGenerator.cs
+++ b/src/Serilog.Sinks.MSSqlServer/Sinks/MSSqlServer/Output/StandardColumnDataGenerator.cs
@@ -51,13 +51,16 @@ public KeyValuePair<string, object> GetStandardColumnNameAndValue(StandardColumn
                 case StandardColumn.Level:
                     return new KeyValuePair<string, object>(_columnOptions.Level.ColumnName, _columnOptions.Level.StoreAsEnum ? (object)logEvent.Level : logEvent.Level.ToString());
                 case StandardColumn.TraceId:
-                    return new KeyValuePair<string, object>(_columnOptions.TraceId.ColumnName, logEvent.TraceId.ToString());
+                    var useDefaultTraceIdValue = logEvent.TraceId is null && !_columnOptions.TraceId.AllowNull;
+                    return new KeyValuePair<string, object>(_columnOptions.TraceId.ColumnName, useDefaultTraceIdValue ? _columnOptions.TraceId.AsDataColumn().DefaultValue.ToString() : logEvent.TraceId?.ToString());
                 case StandardColumn.SpanId:
-                    return new KeyValuePair<string, object>(_columnOptions.SpanId.ColumnName, logEvent.SpanId.ToString());
+                    var useDefaultSpanIdValue = logEvent.SpanId is null && !_columnOptions.SpanId.AllowNull;
+                    return new KeyValuePair<string, object>(_columnOptions.SpanId.ColumnName, useDefaultSpanIdValue ? _columnOptions.SpanId.AsDataColumn().DefaultValue.ToString() : logEvent.SpanId?.ToString());
                 case StandardColumn.TimeStamp:
                     return GetTimeStampStandardColumnNameAndValue(logEvent);
                 case StandardColumn.Exception:
-                    return new KeyValuePair<string, object>(_columnOptions.Exception.ColumnName, logEvent.Exception?.ToString().TruncateOutput(_columnOptions.Exception.DataLength));
+                    var useDefaultExceptionValue = logEvent.Exception is null && !_columnOptions.Exception.AllowNull;
+                    return new KeyValuePair<string, object>(_columnOptions.Exception.ColumnName, useDefaultExceptionValue ? _columnOptions.Exception.AsDataColumn().DefaultValue.ToString() : logEvent.Exception?.ToString().TruncateOutput(_columnOptions.Exception.DataLength));
                 case StandardColumn.Properties:
                     return new KeyValuePair<string, object>(_columnOptions.Properties.ColumnName, ConvertPropertiesToXmlStructure(logEvent.Properties));
                 case StandardColumn.LogEvent:
diff --git a/test/Serilog.Sinks.MSSqlServer.Tests/Sinks/MSSqlServer/Output/StandardColumnDataGeneratorTests.cs b/test/Serilog.Sinks.MSSqlServer.Tests/Sinks/MSSqlServer/Output/StandardColumnDataGeneratorTests.cs
index a14b7302..9c0b3265 100644
--- a/test/Serilog.Sinks.MSSqlServer.Tests/Sinks/MSSqlServer/Output/StandardColumnDataGeneratorTests.cs
+++ b/test/Serilog.Sinks.MSSqlServer.Tests/Sinks/MSSqlServer/Output/StandardColumnDataGeneratorTests.cs
@@ -282,6 +282,46 @@ public void GetStandardColumnNameAndValueForTraceIdReturnsLogLevelKeyValue()
             Assert.Equal("34898a9020e0390190b0982370034f00", result.Value);
         }
 
+        [Fact]
+        public void GetStandardColumnNameAndNullValueForTraceIdReturnsLogLevelKeyValue()
+        {
+            // Arrange
+            var traceId = default(ActivityTraceId);
+            var logEvent = new LogEvent(
+                new DateTimeOffset(2020, 1, 1, 0, 0, 0, 0, TimeSpan.Zero),
+                LogEventLevel.Debug, null, new MessageTemplate(new List<MessageTemplateToken>() { new TextToken("Test message") }),
+                new List<LogEventProperty>(), traceId, ActivitySpanId.CreateRandom());
+            SetupSut(new MSSqlServer.ColumnOptions(), CultureInfo.InvariantCulture);
+
+            // Act
+            var result = _sut.GetStandardColumnNameAndValue(StandardColumn.TraceId, logEvent);
+
+            // Assert
+            Assert.Equal("TraceId", result.Key);
+            Assert.Null(result.Value);
+        }
+
+        [Fact]
+        public void GetStandardColumnNameAndNullValueForTraceIdWithoutAllowNullReturnsLogLevelKeyValueEmpty()
+        {
+            // Arrange
+            var traceId = default(ActivityTraceId);
+            var logEvent = new LogEvent(
+                new DateTimeOffset(2020, 1, 1, 0, 0, 0, 0, TimeSpan.Zero),
+                LogEventLevel.Debug, null, new MessageTemplate(new List<MessageTemplateToken>() { new TextToken("Test message") }),
+                new List<LogEventProperty>(), traceId, ActivitySpanId.CreateRandom());
+            var columnOptions = new MSSqlServer.ColumnOptions();
+            columnOptions.TraceId.AllowNull = false;
+            SetupSut(columnOptions, CultureInfo.InvariantCulture);
+
+            // Act
+            var result = _sut.GetStandardColumnNameAndValue(StandardColumn.TraceId, logEvent);
+
+            // Assert
+            Assert.Equal("TraceId", result.Key);
+            Assert.Equal(string.Empty, result.Value);
+        }
+
         [Fact]
         public void GetStandardColumnNameAndValueForSpanIdReturnsLogLevelKeyValue()
         {
@@ -301,6 +341,46 @@ public void GetStandardColumnNameAndValueForSpanIdReturnsLogLevelKeyValue()
             Assert.Equal("0390190b09823700", result.Value);
         }
 
+        [Fact]
+        public void GetStandardColumnNameAndNullValueForSpanIdReturnsLogLevelKeyValue()
+        {
+            // Arrange
+            var spanId = default(ActivitySpanId);
+            var logEvent = new LogEvent(
+                new DateTimeOffset(2020, 1, 1, 0, 0, 0, 0, TimeSpan.Zero),
+                LogEventLevel.Debug, null, new MessageTemplate(new List<MessageTemplateToken>() { new TextToken("Test message") }),
+                new List<LogEventProperty>(), ActivityTraceId.CreateRandom(), spanId);
+            SetupSut(new MSSqlServer.ColumnOptions(), CultureInfo.InvariantCulture);
+
+            // Act
+            var result = _sut.GetStandardColumnNameAndValue(StandardColumn.SpanId, logEvent);
+
+            // Assert
+            Assert.Equal("SpanId", result.Key);
+            Assert.Null(result.Value);
+        }
+
+        [Fact]
+        public void GetStandardColumnNameAndNullValueForSpanIdWithoutAllowNullReturnsLogLevelKeyValueEmpty()
+        {
+            // Arrange
+            var spanId = default(ActivitySpanId);
+            var logEvent = new LogEvent(
+                new DateTimeOffset(2020, 1, 1, 0, 0, 0, 0, TimeSpan.Zero),
+                LogEventLevel.Debug, null, new MessageTemplate(new List<MessageTemplateToken>() { new TextToken("Test message") }),
+                new List<LogEventProperty>(), ActivityTraceId.CreateRandom(), spanId);
+            var columnOptions = new MSSqlServer.ColumnOptions();
+            columnOptions.SpanId.AllowNull = false;
+            SetupSut(columnOptions, CultureInfo.InvariantCulture);
+
+            // Act
+            var result = _sut.GetStandardColumnNameAndValue(StandardColumn.SpanId, logEvent);
+
+            // Assert
+            Assert.Equal("SpanId", result.Key);
+            Assert.Equal(string.Empty, result.Value);
+        }
+
         [Fact]
         public void GetStandardColumnNameAndValueForLogLevelReturnsLogLevelKeyValueAsEnum()
         {
@@ -449,6 +529,27 @@ public void GetStandardColumnNameAndValueForExceptionWhenCalledWithoutExceptionR
             Assert.Null(result.Value);
         }
 
+        [Fact]
+        public void GetStandardColumnNameAndValueForExceptionWhenCalledWithoutExceptionAndNotAllowedNullReturnsEmptyValue()
+        {
+            // Arrange
+            var logEvent = new LogEvent(
+                new DateTimeOffset(2020, 1, 1, 0, 0, 0, 0, TimeSpan.Zero),
+                LogEventLevel.Debug, null, new MessageTemplate(new List<MessageTemplateToken>() { new TextToken("Test message") }),
+                new List<LogEventProperty>());
+            var columnOptions = new Serilog.Sinks.MSSqlServer.ColumnOptions();
+            columnOptions.Level.StoreAsEnum = true;
+            columnOptions.Exception.AllowNull = false;
+            SetupSut(columnOptions, CultureInfo.InvariantCulture);
+
+            // Act
+            var result = _sut.GetStandardColumnNameAndValue(StandardColumn.Exception, logEvent);
+
+            // Assert
+            Assert.Equal("Exception", result.Key);
+            Assert.Equal(string.Empty, result.Value);
+        }
+
         [Fact]
         public void GetStandardColumnNameAndValueForPropertiesUsesRootElementName()
         {