diff --git a/appsettings/package-lock.json b/appsettings/package-lock.json
index 6965619805..3852adef2e 100644
--- a/appsettings/package-lock.json
+++ b/appsettings/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "@microsoft/vscode-azext-azureappsettings",
-    "version": "0.2.0",
+    "version": "0.2.1",
     "lockfileVersion": 2,
     "requires": true,
     "packages": {
         "": {
             "name": "@microsoft/vscode-azext-azureappsettings",
-            "version": "0.2.0",
+            "version": "0.2.1",
             "license": "MIT",
             "dependencies": {
                 "@microsoft/vscode-azext-utils": "^2.0.0"
diff --git a/appsettings/package.json b/appsettings/package.json
index 106f30ed29..b8dbfdddf1 100644
--- a/appsettings/package.json
+++ b/appsettings/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@microsoft/vscode-azext-azureappsettings",
     "author": "Microsoft Corporation",
-    "version": "0.2.0",
+    "version": "0.2.1",
     "description": "Common features and tools surrounding App Settings for the Azure VS Code extensions",
     "tags": [
         "azure",
diff --git a/appsettings/src/tree/AppSettingsTreeItem.ts b/appsettings/src/tree/AppSettingsTreeItem.ts
index 9eb2b2d659..83829bee46 100644
--- a/appsettings/src/tree/AppSettingsTreeItem.ts
+++ b/appsettings/src/tree/AppSettingsTreeItem.ts
@@ -5,6 +5,7 @@
 
 import type { StringDictionary } from '@azure/arm-appservice';
 import { AzExtParentTreeItem, AzExtTreeItem, createContextValue, IActionContext, ICreateChildImplContext, TreeItemIconPath } from '@microsoft/vscode-azext-utils';
+import * as vscode from 'vscode';
 import { ThemeIcon } from 'vscode';
 import { AppSettingsClientProvider, IAppSettingsClient } from '../IAppSettingsClient';
 import { AppSettingTreeItem } from './AppSettingTreeItem';
@@ -35,6 +36,14 @@ export function validateAppSettingKey(settings: StringDictionary, client: IAppSe
     return undefined;
 }
 
+export function validateAppSettingValue(value: string): string | undefined {
+    if (!value.trim()) {
+        return vscode.l10n.t('App setting values cannot be null, undefined or an empty string.');
+    }
+
+    return undefined;
+}
+
 interface AppSettingsTreeItemOptions {
     supportsSlots?: boolean;
     settingsToHide?: string[];
@@ -131,7 +140,8 @@ export class AppSettingsTreeItem extends AzExtParentTreeItem {
 
         const newValue: string = await context.ui.showInputBox({
             prompt: `Enter value for "${newKey}"`,
-            stepName: 'appSettingValue'
+            stepName: 'appSettingValue',
+            validateInput: (v: string): string | undefined => validateAppSettingValue(v)
         });
 
         if (!settings.properties) {