diff --git a/bigstream/piecewise_align.py b/bigstream/piecewise_align.py
index 90cb6d4..e336423 100644
--- a/bigstream/piecewise_align.py
+++ b/bigstream/piecewise_align.py
@@ -383,7 +383,8 @@ def align_single_block(single_block_data, static_transform_list):
                         missing_weights[region] += weights[neighbor_region]
     
                 # rebalance the weights
-                weights = weights / (1 - missing_weights)
+                with np.errstate(divide='ignore', invalid='ignore'):
+                    weights = weights / (1 - missing_weights)
                 weights[np.isnan(weights)] = 0.  # edges of blocks are 0/0
                 weights = weights.astype(np.float32)
     
diff --git a/bigstream/transform.py b/bigstream/transform.py
index 09e671c..100dbb2 100644
--- a/bigstream/transform.py
+++ b/bigstream/transform.py
@@ -235,7 +235,12 @@ def apply_transform_to_coordinates(
             ndims = transform.shape[-1]
             if 'mode' not in kwargs.keys(): kwargs['mode'] = 'nearest'
             interp = lambda x: map_coordinates(x, coordinates, **kwargs)
-            dX = np.array([interp(transform[..., i]) for i in range(ndims)]).transpose()
+            dX = []
+            for i in range(ndims):
+                if transform[..., i]:
+                    dX.append(interp(transform[..., i]))
+                else:
+                    dX.append(interp([0])
             coordinates = coordinates.transpose() * spacing + dX
             if origin is not None: coordinates += origin