diff --git a/code/Ogre/OgreBinarySerializer.cpp b/code/Ogre/OgreBinarySerializer.cpp
index b2326e244..589e69c7e 100644
--- a/code/Ogre/OgreBinarySerializer.cpp
+++ b/code/Ogre/OgreBinarySerializer.cpp
@@ -864,6 +864,8 @@ bool OgreBinarySerializer::ImportSkeleton(Assimp::IOSystem *pIOHandler, Mesh *me
     }
 
     MemoryStreamReaderPtr reader = OpenReader(pIOHandler, mesh->skeletonRef);
+    if (!reader)
+      return false;
 
     Skeleton *skeleton = new Skeleton();
     OgreBinarySerializer serializer(reader.get(), OgreBinarySerializer::AM_Skeleton);
diff --git a/code/X3D/FIReader.cpp b/code/X3D/FIReader.cpp
old mode 100755
new mode 100644
diff --git a/code/glTF/glTFImporter.cpp b/code/glTF/glTFImporter.cpp
old mode 100755
new mode 100644
diff --git a/code/glTF2/glTF2Asset.inl b/code/glTF2/glTF2Asset.inl
old mode 100755
new mode 100644
diff --git a/code/glTF2/glTF2Importer.cpp b/code/glTF2/glTF2Importer.cpp
old mode 100755
new mode 100644