diff --git a/ocsmesh/mesh/mesh.py b/ocsmesh/mesh/mesh.py
index ebb953f4..ec8110b1 100644
--- a/ocsmesh/mesh/mesh.py
+++ b/ocsmesh/mesh/mesh.py
@@ -417,7 +417,7 @@ def interpolate(
                             vert_cs = rast_crs.source_crs
 
 
-                vert_cs_name = vert_cs.name
+                vert_cs_name = vert_cs.name if vert_cs else None
                 idxs = np.argwhere(mask).ravel()
                 interp_info_map.update({
                     idx: (rast.path, vert_cs_name)