From 8e77bcc930bc8a6b0696a8c83369bd16e23b1833 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bj=C3=B8rn=20Erik=20Pedersen?=
 <bjorn.erik.pedersen@gmail.com>
Date: Wed, 14 Sep 2022 19:42:55 +0200
Subject: [PATCH] Filter out any duplicate files to post process

Updates #10269
---
 hugolib/hugo_sites_build.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hugolib/hugo_sites_build.go b/hugolib/hugo_sites_build.go
index 3bebc5284..5eee564aa 100644
--- a/hugolib/hugo_sites_build.go
+++ b/hugolib/hugo_sites_build.go
@@ -438,7 +438,8 @@ func (h *HugoSites) postProcess() error {
 		return nil
 	}
 
-	for _, filename := range h.Deps.FilenameHasPostProcessPrefix {
+	filenames := helpers.UniqueStrings(h.Deps.FilenameHasPostProcessPrefix)
+	for _, filename := range filenames {
 		filename := filename
 		g.Run(func() error {
 			return handleFile(filename)