Change check, now that the meaning of base has changed.

theano/sandbox/cuda/cuda_ndarray.cu

@@ -1658,8 +1658,15 @@ CudaNdarray_setitem(PyObject *o, PyObject  *key, PyObject  *value)
         //PyErr_SetString(PyExc_RuntimeError, "__getitem__ returned an error");
         return -1;
     }
-    else if((rval != (CudaNdarray*)o && rval->data_allocated) ||
-             (rval != (CudaNdarray*)o && rval->base != o))
+    else if(rval != (CudaNdarray*)o &&
+                (rval->data_allocated ||
+                 // The new array should have a base
+                 !(((CudaNdarray*)rval)->base) ||
+                 // If the original array has no base, the base of the new
+                 // array should be the original one
+                 (!((CudaNdarray*)o)->base && ((CudaNdarray*)rval)->base != o)
+                 // Else, the two arrays should have the same base
+                 || ((CudaNdarray*)rval)->base != ((CudaNdarray*)o)->base))
     {
         // This case shouldn't happen, based on what I see in Subscript
         // but just in case it happens sometime in the future