diff --git a/code/X/XFileImporter.cpp b/code/X/XFileImporter.cpp
index 10547bb8a..be7256d5c 100644
--- a/code/X/XFileImporter.cpp
+++ b/code/X/XFileImporter.cpp
@@ -332,7 +332,7 @@ void XFileImporter::CreateMeshes( aiScene* pScene, aiNode* pNode, const std::vec
 
                 // collect vertex data for indices of this face
                 for( unsigned int d = 0; d < df.mNumIndices; ++d ) {
-                    df.mIndices[d] = newIndex;
+                    df.mIndices[ d ] = newIndex;
                     const unsigned int newIdx( pf.mIndices[ d ] );
                     if ( newIdx > sourceMesh->mPositions.size() ) {
                         continue;
@@ -344,7 +344,10 @@ void XFileImporter::CreateMeshes( aiScene* pScene, aiNode* pNode, const std::vec
                     mesh->mVertices[newIndex] = sourceMesh->mPositions[pf.mIndices[d]];
                     // Normal, if present
                     if ( mesh->HasNormals() ) {
-                        mesh->mNormals[ newIndex ] = sourceMesh->mNormals[ sourceMesh->mNormFaces[ f ].mIndices[ d ] ];
+                        if ( sourceMesh->mNormFaces[ f ].mIndices.size() > d ) {
+                            const size_t idx( sourceMesh->mNormFaces[ f ].mIndices[ d ] );
+                            mesh->mNormals[ newIndex ] = sourceMesh->mNormals[ idx ];
+                        }
                     }
 
                     // texture coord sets
diff --git a/code/X/XFileImporter.h b/code/X/XFileImporter.h
index d1b8d3f47..7d12b6fdf 100644
--- a/code/X/XFileImporter.h
+++ b/code/X/XFileImporter.h
@@ -58,13 +58,13 @@ struct aiNode;
 namespace Assimp    {
 
 namespace XFile {
-struct Scene;
-struct Node;
+    struct Scene;
+    struct Node;
 }
 
 // ---------------------------------------------------------------------------
 /** The XFileImporter is a worker class capable of importing a scene from a
- * DirectX file .x
+ *   DirectX file .x
  */
 class XFileImporter : public BaseImporter {
 public:
diff --git a/code/X/XFileParser.cpp b/code/X/XFileParser.cpp
index ed715a19d..08d3c88da 100644
--- a/code/X/XFileParser.cpp
+++ b/code/X/XFileParser.cpp
@@ -583,24 +583,30 @@ void XFileParser::ParseDataObjectMeshNormals( Mesh* pMesh)
     pMesh->mNormals.resize( numNormals);
 
     // read normal vectors
-    for( unsigned int a = 0; a < numNormals; a++)
+    for( unsigned int a = 0; a < numNormals; ++a) {
         pMesh->mNormals[a] = ReadVector3();
+    }
 
     // read normal indices
     unsigned int numFaces = ReadInt();
-    if( numFaces != pMesh->mPosFaces.size())
+    if( numFaces != pMesh->mPosFaces.size()) {
         ThrowException( "Normal face count does not match vertex face count.");
+    }
 
-    for( unsigned int a = 0; a < numFaces; a++)
-    {
-        unsigned int numIndices = ReadInt();
-        pMesh->mNormFaces.push_back( Face());
-        Face& face = pMesh->mNormFaces.back();
+    // do not crah when no face definitions are there
+    if (numFaces > 0) {
+        // normal face creation
+        pMesh->mNormFaces.resize( pMesh->mNormFaces.size() + numFaces );
+        for( unsigned int a = 0; a < numFaces; ++a ) {
+            unsigned int numIndices = ReadInt();
+            pMesh->mNormFaces.push_back( Face() );
+            Face& face = pMesh->mNormFaces.back();
+            for( unsigned int b = 0; b < numIndices; ++b ) {
+                face.mIndices.push_back( ReadInt());
+            }
 
-        for( unsigned int b = 0; b < numIndices; b++)
-            face.mIndices.push_back( ReadInt());
-
-        TestForSeparator();
+            TestForSeparator();
+        }
     }
 
     CheckForClosingBrace();
diff --git a/test/models/PLY/cube_test.ply b/test/models/PLY/cube_test.ply
index bb0839286..194798cf0 100644
--- a/test/models/PLY/cube_test.ply
+++ b/test/models/PLY/cube_test.ply
@@ -1,6 +1,6 @@
 ply
 format ascii 1.0
-comment Created by Open Asset Import Library - http://assimp.sf.net (v4.1.2760932948)
+comment Created by Open Asset Import Library - http://assimp.sf.net (v4.1.3945266037)
 element vertex 8
 property float x
 property float y
diff --git a/test/unit/utBlendImportMaterials.cpp b/test/unit/utBlendImportMaterials.cpp
index cefacbe27..151c614c0 100644
--- a/test/unit/utBlendImportMaterials.cpp
+++ b/test/unit/utBlendImportMaterials.cpp
@@ -133,10 +133,10 @@ TEST_F(BlendImportMaterials, testImportMaterialwith2texturesAnd2TexCoordMappings
 
     // material has 2 diffuse textures
     ASSERT_TRUE(pTest->HasMaterials());
-    EXPECT_EQ(1, pTest->mNumMaterials);
+    EXPECT_EQ(1u, pTest->mNumMaterials);
     const aiMaterial *pMat = pTest->mMaterials[0];
     ASSERT_TRUE(nullptr != pMat);
-    ASSERT_EQ(2, pMat->GetTextureCount(aiTextureType_DIFFUSE));
+    ASSERT_EQ(2u, pMat->GetTextureCount(aiTextureType_DIFFUSE));
     aiString aPath;
     aiTextureMapping tm = aiTextureMapping::aiTextureMapping_OTHER;
     aiReturn result = pMat->GetTexture(aiTextureType_DIFFUSE, 0, &aPath, &tm);
@@ -146,7 +146,7 @@ TEST_F(BlendImportMaterials, testImportMaterialwith2texturesAnd2TexCoordMappings
 
     // mesh has 2 texturecoord sets
     ASSERT_TRUE(pTest->HasMeshes());
-    EXPECT_EQ(1, pTest->mNumMeshes);
+    EXPECT_EQ(1u, pTest->mNumMeshes);
     const aiMesh *pMesh = pTest->mMeshes[0];
     ASSERT_TRUE(nullptr != pMesh);
     ASSERT_TRUE(pMesh->HasTextureCoords(0));