Index: storage.hpp
===================================================================
--- storage.hpp	(revision 76962)
+++ storage.hpp	(working copy)
@@ -201,7 +201,11 @@
         unbounded_array &operator = (const unbounded_array &a) {
             if (this != &a) {
                 resize (a.size_);
-                std::copy (a.data_, a.data_ + a.size_, data_);
+                if(a.data_ == NULL) {
+					data_ = NULL;
+				} else {
+					std::copy (a.data_, a.data_ + a.size_, data_);
+				}
             }
             return *this;
         }