diff --git a/src/module/mock.ts b/src/module/mock.ts
index 166608559..8997a621a 100644
--- a/src/module/mock.ts
+++ b/src/module/mock.ts
@@ -30,7 +30,7 @@ export function setupImportMocking() {
 
   nuxt.hook('imports:sources', (presets) => {
     // because the native setInterval cannot be mocked
-    const idx = presets.findIndex(p => p.imports.includes('setInterval'))
+    const idx = presets.findIndex(p => p.imports?.includes('setInterval'))
     if (idx !== -1) {
       presets.splice(idx, 1)
     }