diff --git a/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Input/TextInput.cs b/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Input/TextInput.cs
index 7d0d5916db..539a08c758 100644
--- a/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Input/TextInput.cs
+++ b/libraries/Microsoft.Bot.Builder.Dialogs.Adaptive/Input/TextInput.cs
@@ -54,7 +54,11 @@ public TextInput([CallerFilePath] string callerPath = "", [CallerLineNumber] int
                 var (outputValue, error) = this.OutputFormat.TryGetValue(dc.State);
                 if (error == null)
                 {
-                    input = outputValue.ToString();
+                    if (!string.IsNullOrWhiteSpace(outputValue))
+                    {
+                        // if the result is null or empty string, ignore it.
+                        input = outputValue.ToString();
+                    }
                 }
                 else
                 {
diff --git a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/ActionTests/Action_TextInput.test.dialog b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/ActionTests/Action_TextInput.test.dialog
index c9cbfd8e83..9edf280b26 100644
--- a/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/ActionTests/Action_TextInput.test.dialog
+++ b/tests/Microsoft.Bot.Builder.Dialogs.Adaptive.Tests/Tests/ActionTests/Action_TextInput.test.dialog
@@ -30,7 +30,8 @@
                         "unrecognizedPrompt": "How should I call you?",
                         "validations": [
                             "this.value.Length > 3"
-                        ]
+                        ],
+                        "outputFormat": ""
                     },
                     {
                         "$kind": "Microsoft.SendActivity",