diff --git a/src/Microsoft.AspNet.Server.Testing/Deployers/ApplicationDeployer.cs b/src/Microsoft.AspNet.Server.Testing/Deployers/ApplicationDeployer.cs
index 55893b7aec..6dd076e1a1 100644
--- a/src/Microsoft.AspNet.Server.Testing/Deployers/ApplicationDeployer.cs
+++ b/src/Microsoft.AspNet.Server.Testing/Deployers/ApplicationDeployer.cs
@@ -92,8 +92,8 @@ namespace Microsoft.AspNet.Server.Testing
             };
 
             var hostProcess = new Process() { StartInfo = startInfo };
-            hostProcess.ErrorDataReceived += (sender, dataArgs) => { Logger.LogError(dataArgs.Data); };
-            hostProcess.OutputDataReceived += (sender, dataArgs) => { Logger.LogInformation(dataArgs.Data); };
+            hostProcess.ErrorDataReceived += (sender, dataArgs) => { Logger.LogError(dataArgs.Data ?? string.Empty); };
+            hostProcess.OutputDataReceived += (sender, dataArgs) => { Logger.LogInformation(dataArgs.Data ?? string.Empty); };
             hostProcess.Start();
             hostProcess.BeginErrorReadLine();
             hostProcess.BeginOutputReadLine();
diff --git a/src/Microsoft.AspNet.Server.Testing/Deployers/IISExpressDeployer.cs b/src/Microsoft.AspNet.Server.Testing/Deployers/IISExpressDeployer.cs
index 5c63d28982..5dbf924e5a 100644
--- a/src/Microsoft.AspNet.Server.Testing/Deployers/IISExpressDeployer.cs
+++ b/src/Microsoft.AspNet.Server.Testing/Deployers/IISExpressDeployer.cs
@@ -107,8 +107,8 @@ namespace Microsoft.AspNet.Server.Testing
 #endif
 
             _hostProcess = new Process() { StartInfo = startInfo };
-            _hostProcess.ErrorDataReceived += (sender, dataArgs) => { Logger.LogError(dataArgs.Data); };
-            _hostProcess.OutputDataReceived += (sender, dataArgs) => { Logger.LogInformation(dataArgs.Data); };
+            _hostProcess.ErrorDataReceived += (sender, dataArgs) => { Logger.LogError(dataArgs.Data ?? string.Empty); };
+            _hostProcess.OutputDataReceived += (sender, dataArgs) => { Logger.LogInformation(dataArgs.Data ?? string.Empty); };
             _hostProcess.EnableRaisingEvents = true;
             var hostExitTokenSource = new CancellationTokenSource();
             _hostProcess.Exited += (sender, e) =>
diff --git a/src/Microsoft.AspNet.Server.Testing/Deployers/SelfHostDeployer.cs b/src/Microsoft.AspNet.Server.Testing/Deployers/SelfHostDeployer.cs
index e0121bdfd4..e23ae53cef 100644
--- a/src/Microsoft.AspNet.Server.Testing/Deployers/SelfHostDeployer.cs
+++ b/src/Microsoft.AspNet.Server.Testing/Deployers/SelfHostDeployer.cs
@@ -68,8 +68,8 @@ namespace Microsoft.AspNet.Server.Testing
             AddEnvironmentVariablesToProcess(startInfo);
 
             _hostProcess = new Process() { StartInfo = startInfo };
-            _hostProcess.ErrorDataReceived += (sender, dataArgs) => { Logger.LogError(dataArgs.Data); };
-            _hostProcess.OutputDataReceived += (sender, dataArgs) => { Logger.LogInformation(dataArgs.Data); };
+            _hostProcess.ErrorDataReceived += (sender, dataArgs) => { Logger.LogError(dataArgs.Data ?? string.Empty); };
+            _hostProcess.OutputDataReceived += (sender, dataArgs) => { Logger.LogInformation(dataArgs.Data ?? string.Empty); };
             _hostProcess.EnableRaisingEvents = true;
             var hostExitTokenSource = new CancellationTokenSource();
             _hostProcess.Exited += (sender, e) =>