diff --git a/frontend/test/seriesManage.spec.js b/frontend/test/seriesManage.spec.js
index 3076d6a..a094741 100644
--- a/frontend/test/seriesManage.spec.js
+++ b/frontend/test/seriesManage.spec.js
@@ -40,7 +40,7 @@ describe('seriesManage', () => {
     s.pages = [{ image_id: 1 }, { image_id: 2 }, { image_id: 3 }]
     const calls = []
     stubFetch((url, init) => {
-      calls.push({ url, body: JSON.parse(init.body) })
+      calls.push({ url, body: init.body ? JSON.parse(init.body) : null })
       if (url.includes('/reorder')) return { status: 200, body: { ok: true } }
       return { status: 200, body: { series: { id: 7, name: 'V' }, pages: [] } }
     })