crash initializing size_t array

[drwbns]

Hi guys, I'm wondering why I get a crash when initializing the indices array below (bottom)-

  struct TerrainGroupData
      {
         TerrainGroupData(){};
         TerrainGroupData(Ogre::Vector3 ** iVertices, unsigned long ** iIndices, size_t* iFaceNum, size_t* iVertNum)

         {

            vertices = iVertices;

            indices = iIndices;

            meshIndexCount = iFaceNum;

            meshVertexCount = iVertNum;

         }
         ~TerrainGroupData(){
            delete [] vertices;
            delete [] indices;
         };
         size_t *meshVertexCount;
         size_t *meshIndexCount;

         Ogre::Vector3 ** vertices;

         unsigned long ** indices;

      };
...
// using the struct  in cpp file 
         terrainGroupData.indices = new unsigned long*[1];
         size_t size = 3;

         // resize this terrain's index buffer
         terrainGroupData.indices[0] = new unsigned long[size]; // crash here