diff --git a/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib/src/main/java/com/microsoft/azure/toolkit/intellij/common/BaseAzureTextInput.java b/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib/src/main/java/com/microsoft/azure/toolkit/intellij/common/BaseAzureTextInput.java
index bee2000ae4..e7c45a4c94 100644
--- a/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib/src/main/java/com/microsoft/azure/toolkit/intellij/common/BaseAzureTextInput.java
+++ b/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib/src/main/java/com/microsoft/azure/toolkit/intellij/common/BaseAzureTextInput.java
@@ -23,16 +23,16 @@
 import java.util.function.Function;
 
 public class BaseAzureTextInput<T> extends ExtendableTextField
-        implements AzureFormInputComponent<T>, TextDocumentListenerAdapter {
+    implements AzureFormInputComponent<T>, TextDocumentListenerAdapter {
     protected static final int DEBOUNCE_DELAY = 500;
     private final Debouncer debouncer;
     private static final Extension VALIDATING = Extension.create(AnimatedIcon.Default.INSTANCE, "Validating...", null);
     private static final Extension SUCCESS = Extension.create(AllIcons.General.InspectionsOK, "Validation passed.", null);
     private static final Map<AzureValidationInfo.Type, Function<AzureValidationInfo, Extension>> extensions = ImmutableMap.of(
-            AzureValidationInfo.Type.PENDING, (i) -> VALIDATING,
-            AzureValidationInfo.Type.SUCCESS, (i) -> SUCCESS,
-            AzureValidationInfo.Type.ERROR, (i) -> Extension.create(AllIcons.General.BalloonError, i.getMessage(), null),
-            AzureValidationInfo.Type.WARNING, (i) -> Extension.create(AllIcons.General.BalloonWarning, i.getMessage(), null)
+        AzureValidationInfo.Type.PENDING, (i) -> VALIDATING,
+        AzureValidationInfo.Type.SUCCESS, (i) -> SUCCESS,
+        AzureValidationInfo.Type.ERROR, (i) -> Extension.create(AllIcons.General.BalloonError, i.getMessage(), null),
+        AzureValidationInfo.Type.WARNING, (i) -> Extension.create(AllIcons.General.BalloonWarning, i.getMessage(), null)
     );
     protected Extension validationExtension;
 
@@ -63,12 +63,14 @@ public void onDocumentChanged() {
         this.debouncer.debounce();
     }
 
-    protected synchronized void setValidationExtension(final Extension extension) {
+    protected synchronized void setValidationExtension(@Nullable final Extension extension) {
         AzureTaskManager.getInstance().runLater(() -> {
             if (validationExtension != null) {
                 this.removeExtension(validationExtension);
             }
-            this.addExtension(extension);
+            if (Objects.nonNull(extension)) {
+                this.addExtension(extension);
+            }
             this.validationExtension = extension;
         }, AzureTask.Modality.ANY);
     }