From b7511a052e4a6086373e4e3c0078a38d4f8226e6 Mon Sep 17 00:00:00 2001
From: "Joachim Wuttke (o)" <j.wuttke@fz-juelich.de>
Date: Tue, 7 Dec 2021 16:55:52 +0100
Subject: [PATCH] + const

---
 GUI/Model/Project/ProjectDocument.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/GUI/Model/Project/ProjectDocument.cpp b/GUI/Model/Project/ProjectDocument.cpp
index 647333c7580..b97371e418e 100644
--- a/GUI/Model/Project/ProjectDocument.cpp
+++ b/GUI/Model/Project/ProjectDocument.cpp
@@ -354,8 +354,8 @@ ProjectDocument::ReadResult ProjectDocument::readProject(QIODevice* device,
             itemWithMaterial->setMaterialModel(materialModel());
 
     // make a sanity check whether all materials are present
-    for (auto* multiLayerItem : m_applicationModels.sampleModel()->multiLayerItems())
-        for (auto* itemWithMaterial : multiLayerItem->itemsWithMaterial())
+    for (const auto* multiLayerItem : m_applicationModels.sampleModel()->multiLayerItems())
+        for (const auto* itemWithMaterial : multiLayerItem->itemsWithMaterial())
             if (itemWithMaterial->materialItem() == nullptr) {
                 QString message = QString("Material link is broken (id: '%1')")
                                       .arg(itemWithMaterial->materialIdentifier());
-- 
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