diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7f8f96948..1a02a1bdb 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -38,7 +38,7 @@ SET(CMAKE_POLICY_DEFAULT_CMP0012 NEW)
 SET(CMAKE_POLICY_DEFAULT_CMP0074 NEW)
 SET(CMAKE_POLICY_DEFAULT_CMP0092 NEW)
 
-CMAKE_MINIMUM_REQUIRED( VERSION 3.0 )
+CMAKE_MINIMUM_REQUIRED( VERSION 3.10 )
 
 # Toggles the use of the hunter package manager
 option(ASSIMP_HUNTER_ENABLED "Enable Hunter package manager support" OFF)
diff --git a/code/AssetLib/Collada/ColladaLoader.cpp b/code/AssetLib/Collada/ColladaLoader.cpp
index 99cb8c305..96599f22f 100644
--- a/code/AssetLib/Collada/ColladaLoader.cpp
+++ b/code/AssetLib/Collada/ColladaLoader.cpp
@@ -557,7 +557,12 @@ void ColladaLoader::BuildMeshesForNode(const ColladaParser &pParser, const Colla
                 faceStart += submesh.mNumFaces;
 
                 // assign the material index
-                dstMesh->mMaterialIndex = matIdx;
+                std::map<std::string, size_t>::const_iterator subMatIt = mMaterialIndexByName.find(submesh.mMaterial);
+                if (subMatIt != mMaterialIndexByName.end()) {
+                    dstMesh->mMaterialIndex = static_cast<unsigned int>(subMatIt->second);
+                } else {
+                    dstMesh->mMaterialIndex = matIdx;
+                }
                 if (dstMesh->mName.length == 0) {
                     dstMesh->mName = mid.mMeshOrController;
                 }
diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index 74ae837ef..8381b0247 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -43,7 +43,7 @@
 # 3) Add libassimp using the file lists (eliminates duplication of file names between
 #    source groups and library command)
 #
-cmake_minimum_required( VERSION 3.0 )
+cmake_minimum_required( VERSION 3.10 )
 SET( HEADER_PATH ../include/assimp )
 
 if(NOT ANDROID AND ASSIMP_ANDROID_JNIIOSYSTEM)
diff --git a/code/PostProcessing/ValidateDataStructure.cpp b/code/PostProcessing/ValidateDataStructure.cpp
index e7392d9e5..3e0224eac 100644
--- a/code/PostProcessing/ValidateDataStructure.cpp
+++ b/code/PostProcessing/ValidateDataStructure.cpp
@@ -844,7 +844,8 @@ void ValidateDSProcess::Validate(const aiAnimation *pAnimation,
     Validate(&pMeshMorphAnim->mName);
 
     if (!pMeshMorphAnim->mNumKeys) {
-        ReportError("Empty mesh morph animation channel");
+        ReportWarning("Empty mesh morph animation channel");
+        return;
     }
 
     // otherwise check whether one of the keys exceeds the total duration of the animation
diff --git a/contrib/gtest/CMakeLists.txt b/contrib/gtest/CMakeLists.txt
index 621d0f042..1d8362797 100644
--- a/contrib/gtest/CMakeLists.txt
+++ b/contrib/gtest/CMakeLists.txt
@@ -45,7 +45,7 @@ endif()
 # ${gtest_BINARY_DIR}.
 # Language "C" is required for find_package(Threads).
 project(gtest CXX C)
-cmake_minimum_required(VERSION 2.6.2)
+cmake_minimum_required(VERSION 3.10)
 
 if (COMMAND set_up_hermetic_build)
   set_up_hermetic_build()
diff --git a/contrib/openddlparser/CMakeLists.txt b/contrib/openddlparser/CMakeLists.txt
index 6a38acf5f..407f0847e 100644
--- a/contrib/openddlparser/CMakeLists.txt
+++ b/contrib/openddlparser/CMakeLists.txt
@@ -1,4 +1,4 @@
-CMAKE_MINIMUM_REQUIRED( VERSION 2.6 )
+CMAKE_MINIMUM_REQUIRED( VERSION 3.10 )
 PROJECT( OpenDDL-Parser )
 SET ( OPENDDL_PARSER_VERSION_MAJOR 0 )
 SET ( OPENDDL_PARSER_VERSION_MINOR 1 )
diff --git a/contrib/pugixml/CMakeLists.txt b/contrib/pugixml/CMakeLists.txt
index 94541f6da..af6b577e6 100644
--- a/contrib/pugixml/CMakeLists.txt
+++ b/contrib/pugixml/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8.12)
+cmake_minimum_required(VERSION 3.10)
 
 project(pugixml)
 
diff --git a/contrib/zip/CMakeLists.txt b/contrib/zip/CMakeLists.txt
index f194649ed..cdfa94b3b 100644
--- a/contrib/zip/CMakeLists.txt
+++ b/contrib/zip/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.0)
+cmake_minimum_required(VERSION 3.10)
 
 project(zip
   LANGUAGES C
diff --git a/contrib/zip/test/CMakeLists.txt b/contrib/zip/test/CMakeLists.txt
index 122411585..a7c3650f7 100644
--- a/contrib/zip/test/CMakeLists.txt
+++ b/contrib/zip/test/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.10)
 
 # test
 set(test_out test.out)
diff --git a/include/assimp/metadata.h b/include/assimp/metadata.h
index 52121fbf1..e44b97bf3 100644
--- a/include/assimp/metadata.h
+++ b/include/assimp/metadata.h
@@ -350,6 +350,10 @@ struct aiMetadata {
         } else if (nullptr != mValues[index].mData && AI_AIMETADATA == mValues[index].mType) {
             *static_cast<T *>(mValues[index].mData) = value;
         } else {
+            if (nullptr != mValues[index].mData) {
+                delete mValues[index].mData;
+                mValues[index].mData = nullptr;
+            }
             mValues[index].mData = new T(value);
         }
 
diff --git a/port/AndroidJNI/CMakeLists.txt b/port/AndroidJNI/CMakeLists.txt
index ddc718850..8f034db8b 100644
--- a/port/AndroidJNI/CMakeLists.txt
+++ b/port/AndroidJNI/CMakeLists.txt
@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 2.8)
+cmake_minimum_required(VERSION 3.10)
 
 include_directories(./)
 include_directories(./../../)
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 9005a5ec4..15eeced5f 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -36,7 +36,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 #----------------------------------------------------------------------
-cmake_minimum_required( VERSION 3.0 )
+cmake_minimum_required( VERSION 3.10 )
 
 INCLUDE_DIRECTORIES(
     ${Assimp_SOURCE_DIR}/test/unit
diff --git a/test/unit/utMetadata.cpp b/test/unit/utMetadata.cpp
index 81ab61435..d4b0b158f 100644
--- a/test/unit/utMetadata.cpp
+++ b/test/unit/utMetadata.cpp
@@ -51,11 +51,11 @@ class utMetadata: public ::testing::Test {
 protected:
     aiMetadata *m_data;
 
-    virtual void SetUp() {
+    void SetUp() override {
         m_data = nullptr;
     }
 
-    virtual void TearDown() {
+    void TearDown() override {
         aiMetadata::Dealloc( m_data );
     }
 
@@ -261,3 +261,12 @@ TEST_F( utMetadata, copy_test ) {
         EXPECT_EQ( metaVal, v );
     }
 }
+
+TEST_F( utMetadata, set_test ) {
+    aiMetadata v;
+    const std::string key_bool = "test_bool";
+    v.Set(1, key_bool, true);
+    v.Set(1, key_bool, true);
+    v.Set(1, key_bool, true);
+    v.Set(1, key_bool, true);
+}
diff --git a/tools/assimp_cmd/CMakeLists.txt b/tools/assimp_cmd/CMakeLists.txt
index a0eb98a89..afbb13f77 100644
--- a/tools/assimp_cmd/CMakeLists.txt
+++ b/tools/assimp_cmd/CMakeLists.txt
@@ -37,7 +37,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 #----------------------------------------------------------------------
-cmake_minimum_required( VERSION 3.0 )
+cmake_minimum_required( VERSION 3.10 )
 
 INCLUDE_DIRECTORIES(
   ${Assimp_SOURCE_DIR}/include
diff --git a/tools/assimp_view/CMakeLists.txt b/tools/assimp_view/CMakeLists.txt
index 222722388..abb901214 100644
--- a/tools/assimp_view/CMakeLists.txt
+++ b/tools/assimp_view/CMakeLists.txt
@@ -37,7 +37,7 @@
 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #
 #----------------------------------------------------------------------
-cmake_minimum_required( VERSION 3.0 )
+cmake_minimum_required( VERSION 3.10 )
 
 FIND_PACKAGE(DirectX REQUIRED)