diff --git a/code/AssetLib/AMF/AMFImporter_Geometry.cpp b/code/AssetLib/AMF/AMFImporter_Geometry.cpp
index 6a9ccc1aa..7afe52311 100644
--- a/code/AssetLib/AMF/AMFImporter_Geometry.cpp
+++ b/code/AssetLib/AMF/AMFImporter_Geometry.cpp
@@ -61,12 +61,12 @@ namespace Assimp {
 void AMFImporter::ParseNode_Mesh(XmlNode &node) {
     AMFNodeElementBase *ne = nullptr;
 
-    // create new mesh object.
-    ne = new AMFMesh(mNodeElement_Cur);
     // Check for child nodes
     if (0 != ASSIMP_stricmp(node.name(), "mesh")) {
         return;
     }
+    // create new mesh object.
+    ne = new AMFMesh(mNodeElement_Cur);
     bool found_verts = false, found_volumes = false;
     if (!node.empty()) {
         ParseHelper_Node_Enter(ne);
diff --git a/code/AssetLib/AMF/AMFImporter_Material.cpp b/code/AssetLib/AMF/AMFImporter_Material.cpp
index 05ed00848..e1b6c3e8b 100644
--- a/code/AssetLib/AMF/AMFImporter_Material.cpp
+++ b/code/AssetLib/AMF/AMFImporter_Material.cpp
@@ -165,15 +165,15 @@ void AMFImporter::ParseNode_Texture(XmlNode &node) {
 	std::string type = node.attribute("type").as_string();
 	bool tiled = node.attribute("tiled").as_bool();
 
-	// create new texture object.
-    AMFNodeElementBase *ne = new AMFTexture(mNodeElement_Cur);
-
-	AMFTexture& als = *((AMFTexture*)ne);// alias for convenience
-
     if (node.empty()) {
 		return;
     }
 
+    // create new texture object.
+    AMFNodeElementBase *ne = new AMFTexture(mNodeElement_Cur);
+
+	AMFTexture& als = *((AMFTexture*)ne);// alias for convenience
+
     std::string enc64_data = node.value();
 	// Check for child nodes
 
diff --git a/code/Common/DefaultIOSystem.cpp b/code/Common/DefaultIOSystem.cpp
index 2512e57c8..4154aad32 100644
--- a/code/Common/DefaultIOSystem.cpp
+++ b/code/Common/DefaultIOSystem.cpp
@@ -60,19 +60,32 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 using namespace Assimp;
 
 #ifdef _WIN32
+
+const std::wstring wdummy;
+
 static std::wstring Utf8ToWide(const char *in) {
+    if (nullptr == in) {
+        return wdummy;
+    }
     int size = MultiByteToWideChar(CP_UTF8, 0, in, -1, nullptr, 0);
     // size includes terminating null; std::wstring adds null automatically
     std::wstring out(static_cast<size_t>(size) - 1, L'\0');
     MultiByteToWideChar(CP_UTF8, 0, in, -1, &out[0], size);
+    
     return out;
 }
 
+const std::string dummy;
+
 static std::string WideToUtf8(const wchar_t *in) {
+    if (nullptr == in) {
+        return dummy;
+    }
     int size = WideCharToMultiByte(CP_UTF8, 0, in, -1, nullptr, 0, nullptr, nullptr);
     // size includes terminating null; std::string adds null automatically
     std::string out(static_cast<size_t>(size) - 1, '\0');
     WideCharToMultiByte(CP_UTF8, 0, in, -1, &out[0], size, nullptr, nullptr);
+    
     return out;
 }
 #endif
@@ -104,7 +117,12 @@ IOStream *DefaultIOSystem::Open(const char *strFile, const char *strMode) {
     ai_assert(strMode != nullptr);
     FILE *file;
 #ifdef _WIN32
-    file = ::_wfopen(Utf8ToWide(strFile).c_str(), Utf8ToWide(strMode).c_str());
+    std::wstring name = Utf8ToWide(strFile);
+    if (name.empty()) {
+        return nullptr;
+    }
+    
+    file = ::_wfopen(name.c_str(), Utf8ToWide(strMode).c_str());
 #else
     file = ::fopen(strFile, strMode);
 #endif
diff --git a/code/Common/ZipArchiveIOSystem.cpp b/code/Common/ZipArchiveIOSystem.cpp
index 870dd702d..e0c9ebd7a 100644
--- a/code/Common/ZipArchiveIOSystem.cpp
+++ b/code/Common/ZipArchiveIOSystem.cpp
@@ -152,7 +152,7 @@ zlib_filefunc_def IOSystem2Unzip::get(IOSystem *pIOHandler) {
     mapping.ztell_file = (tell_file_func)tell;
     mapping.zseek_file = (seek_file_func)seek;
     mapping.zclose_file = (close_file_func)close;
-    mapping.zerror_file = (error_file_func)testerror;
+    mapping.zerror_file = testerror;
 
     mapping.opaque = reinterpret_cast<voidpf>(pIOHandler);