From 4da672af888cbd0db79463bf456b5210ad9a463d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Erik=20Pedersen?=
 <bjorn.erik.pedersen@gmail.com>
Date: Thu, 13 Jul 2023 15:01:41 +0200
Subject: [PATCH] Return error when .Render is invoked without arg

Fixes #11243
---
 hugolib/page__per_output.go |  3 +++
 hugolib/page_test.go        | 22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/hugolib/page__per_output.go b/hugolib/page__per_output.go
index 65809a377..89dc5ac77 100644
--- a/hugolib/page__per_output.go
+++ b/hugolib/page__per_output.go
@@ -557,6 +557,9 @@ func (p *pageContentOutput) RenderWithTemplateInfo(ctx context.Context, info tpl
 }
 
 func (p *pageContentOutput) Render(ctx context.Context, layout ...string) (template.HTML, error) {
+	if len(layout) == 0 {
+		return "", errors.New("no layout given")
+	}
 	templ, found, err := p.p.resolveTemplate(layout...)
 	if err != nil {
 		return "", p.p.wrapError(err)
diff --git a/hugolib/page_test.go b/hugolib/page_test.go
index 162f26052..5237b6340 100644
--- a/hugolib/page_test.go
+++ b/hugolib/page_test.go
@@ -1983,3 +1983,25 @@ title: "p2"
 	b.Assert(identity.HashString(p1), qt.Not(qt.Equals), identity.HashString(p2))
 	b.Assert(identity.HashString(sites[0]), qt.Not(qt.Equals), identity.HashString(sites[1]))
 }
+
+// Issue #11243
+func TestRenderWithoutArgument(t *testing.T) {
+	t.Parallel()
+
+	files := `
+-- hugo.toml --
+-- layouts/index.html --
+{{ .Render }}
+`
+
+	b, err := NewIntegrationTestBuilder(
+		IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+			Running:     true,
+		},
+	).BuildE()
+
+	b.Assert(err, qt.IsNotNil)
+
+}