diff --git a/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-appservice/src/main/java/com/microsoft/azure/toolkit/intellij/legacy/function/wizard/module/helper/MavenFunctionsModuleBuilderHelper.java b/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-appservice/src/main/java/com/microsoft/azure/toolkit/intellij/legacy/function/wizard/module/helper/MavenFunctionsModuleBuilderHelper.java
index 8e84d87bbc..ab0a3df67e 100644
--- a/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-appservice/src/main/java/com/microsoft/azure/toolkit/intellij/legacy/function/wizard/module/helper/MavenFunctionsModuleBuilderHelper.java
+++ b/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-appservice/src/main/java/com/microsoft/azure/toolkit/intellij/legacy/function/wizard/module/helper/MavenFunctionsModuleBuilderHelper.java
@@ -44,7 +44,6 @@ public static void setupMavenModule(final WizardContext wizardContext, @NotNull
         RefreshQueue.getInstance().refresh(true, true, () -> {
             final String packageName = wizardContext.getUserData(AzureFunctionsConstants.WIZARD_PACKAGE_NAME_KEY);
             final MavenProject parentProject = MavenUtils.getMavenProjectByDirectory(project, parentPath);
-            final MavenProject rootProject = MavenUtils.getRootMavenProject(project, parentProject);
             final MavenId mavenId = new MavenId(groupId, artifactId, version);
             final VirtualFile pomFile = Optional.ofNullable(vf).map(file -> file.findChild(MavenConstants.POM_XML)).orElse(null);
             if (pomFile == null) {
diff --git a/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib-java/src/main/java/com/microsoft/intellij/util/util/MavenUtils.java b/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib-java/src/main/java/com/microsoft/intellij/util/util/MavenUtils.java
index 8cfafc9e2a..fd1aedee35 100644
--- a/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib-java/src/main/java/com/microsoft/intellij/util/util/MavenUtils.java
+++ b/PluginsAndFeatures/azure-toolkit-for-intellij/azure-intellij-plugin-lib-java/src/main/java/com/microsoft/intellij/util/util/MavenUtils.java
@@ -100,6 +100,7 @@ public static String getPluginConfiguration(String effectivePomXml, String group
         return null;
     }
 
+    @Nullable
     public static MavenProject getRootMavenProject(final Project project, final MavenProject mavenProject) {
         if (mavenProject == null) {
             return null;
@@ -108,11 +109,15 @@ public static MavenProject getRootMavenProject(final Project project, final Mave
         MavenId parentId = mavenProject.getParentId();
         while (parentId != null) {
             result = getMavenProjectById(project, parentId);
+            if (result == null) {
+                return null;
+            }
             parentId = result.getParentId();
         }
         return result;
     }
 
+    @Nullable
     public static MavenProject getMavenProjectById(final Project project, final MavenId mavenId) {
         return MavenProjectsManager.getInstance(project).getProjects().stream()
                 .filter(pro -> Objects.equals(pro.getMavenId(), mavenId)).findFirst().orElse(null);