diff --git a/packages/storybook/src/migrations/update-13-4-6/set-project-build-config.ts b/packages/storybook/src/migrations/update-13-4-6/set-project-build-config.ts
index 2ad3e7d842b4f..1f58e288ce233 100644
--- a/packages/storybook/src/migrations/update-13-4-6/set-project-build-config.ts
+++ b/packages/storybook/src/migrations/update-13-4-6/set-project-build-config.ts
@@ -11,6 +11,9 @@ export default async function setProjectBuildConfig(tree: Tree) {
   let changesMade = false;
   const projects = getProjects(tree);
   [...projects.entries()].forEach(([projectName, projectConfiguration]) => {
+    if (!projectConfiguration.targets) {
+      return;
+    }
     const { storybookBuildTarget, storybookTarget, buildTarget } =
       findStorybookAndBuildTargets(projectConfiguration.targets);
     if (