diff --git a/include/json/value.h b/include/json/value.h
index 3884b08..72fcabd 100644
--- a/include/json/value.h
+++ b/include/json/value.h
@@ -917,6 +917,8 @@ public: // overridden from ValueArrayAllocator
    private:
 #ifndef JSON_VALUE_USE_INTERNAL_MAP
       Value::ObjectValues::iterator current_;
+      // Indicates that iterator is for a null value.
+      bool isNull_;
 #else
       union
       {
diff --git a/src/lib_json/json_valueiterator.inl b/src/lib_json/json_valueiterator.inl
index fdc52f6..be88c28 100644
--- a/src/lib_json/json_valueiterator.inl
+++ b/src/lib_json/json_valueiterator.inl
@@ -13,6 +13,7 @@
 ValueIteratorBase::ValueIteratorBase()
 #ifndef JSON_VALUE_USE_INTERNAL_MAP
    : current_()
+   , isNull_( true )
 #else
 # error fix me // Need to handle uninitialized iterator comparison for experimental maps
 #endif
@@ -23,6 +24,7 @@ ValueIteratorBase::ValueIteratorBase()
 #ifndef JSON_VALUE_USE_INTERNAL_MAP
 ValueIteratorBase::ValueIteratorBase( const Value::ObjectValues::iterator &current )
    : current_( current )
+   , isNull_( false )
 {
 }
 #else
@@ -86,6 +88,15 @@ ValueIteratorBase::computeDistance( const SelfType &other ) const
 # ifdef JSON_USE_CPPTL_SMALLMAP
    return current_ - other.current_;
 # else
+   // Iterator for null value are initialized using the default
+   // constructor, which initialize current_ to the default
+   // std::map::iterator. As begin() and end() are two instance 
+   // of the default std::map::iterator, they can not be compared.
+   // To allow this, we handle this comparison specifically.
+   if ( isNull_  &&  other.isNull_ )
+   {
+      return 0;
+   }
    return difference_type( std::distance( current_, other.current_ ) );
 # endif
 #else
@@ -100,6 +111,10 @@ bool
 ValueIteratorBase::isEqual( const SelfType &other ) const
 {
 #ifndef JSON_VALUE_USE_INTERNAL_MAP
+   if ( isNull_ )
+   {
+      return other.isNull_;
+   }
    return current_ == other.current_;
 #else
    if ( isArray_ )
diff --git a/src/test_lib_json/jsontest.cpp b/src/test_lib_json/jsontest.cpp
index cd219bd..dfd2b5c 100644
--- a/src/test_lib_json/jsontest.cpp
+++ b/src/test_lib_json/jsontest.cpp
@@ -505,35 +505,35 @@ Runner::runCommandLine( int argc, const char *argv[] ) const
 
 #if defined(_MSC_VER)
 // Hook MSVCRT assertions to prevent dialog from appearing
-static int 
-msvcrtSilentReportHook( int reportType, char *message, int *returnValue )
-{
-   // The default CRT handling of error and assertion is to display
-   // an error dialog to the user.
-   // Instead, when an error or an assertion occurs, we force the 
-   // application to terminate using abort() after display
-   // the message on stderr. 
-   if ( reportType == _CRT_ERROR  ||  
-        reportType == _CRT_ASSERT )
-   {
-      // calling abort() cause the ReportHook to be called
-      // The following is used to detect this case and let's the
-      // error handler fallback on its default behaviour (
-      // display a warning message)
-      static volatile bool isAborting = false;
-      if ( isAborting ) 
-      {
-         return TRUE;
-      }
-      isAborting = true;
-
-      fprintf( stderr, "CRT Error/Assert:\n%s\n", message );
-      fflush( stderr );
-      abort();
-   }
-   // Let's other reportType (_CRT_WARNING) be handled as they would by default
-   return FALSE;
-}
+static int 
+msvcrtSilentReportHook( int reportType, char *message, int *returnValue )
+{
+   // The default CRT handling of error and assertion is to display
+   // an error dialog to the user.
+   // Instead, when an error or an assertion occurs, we force the 
+   // application to terminate using abort() after display
+   // the message on stderr. 
+   if ( reportType == _CRT_ERROR  ||  
+        reportType == _CRT_ASSERT )
+   {
+      // calling abort() cause the ReportHook to be called
+      // The following is used to detect this case and let's the
+      // error handler fallback on its default behaviour (
+      // display a warning message)
+      static volatile bool isAborting = false;
+      if ( isAborting ) 
+      {
+         return TRUE;
+      }
+      isAborting = true;
+
+      fprintf( stderr, "CRT Error/Assert:\n%s\n", message );
+      fflush( stderr );
+      abort();
+   }
+   // Let's other reportType (_CRT_WARNING) be handled as they would by default
+   return FALSE;
+}
 #endif // if defined(_MSC_VER)