diff --git a/internal/check-studio-every-plugin.mjs b/internal/check-studio-every-plugin.mjs
index ef430417c..eccf2efd6 100644
--- a/internal/check-studio-every-plugin.mjs
+++ b/internal/check-studio-every-plugin.mjs
@@ -39,7 +39,12 @@ const page = await (await browser.newContext({ viewport: { width: 1280, height:
 let current = '(page load)'
 const seen = {}
 const note = (kind, v) => { const s = (seen[current] = seen[current] || { errors: [], failed: [] }); s[kind].push(v) }
-page.on('pageerror', (e) => note('errors', String(e.message || e).slice(0, 160)))
+// Keep the top of the STACK, not just the message: a message like "reading 'getRootNode'" names no
+// caller, and the owner cannot fix it without knowing which call site threw (asked 2026-09-25).
+page.on('pageerror', (e) => {
+  const frames = String(e.stack || '').split('\n').slice(1, 5).map((l) => l.trim().replace(/https?:\/\/[^/]+/, '').replace(/\?v=[0-9a-f]+/, '')).join(' <- ')
+  note('errors', String(e.message || e).slice(0, 160) + (frames ? '  [' + frames + ']' : ''))
+})
 page.on('response', (r) => {
   if (r.status() < 400) return
   let host = ''