Fix

src/awkward/contents/listoffsetarray.py

@@ -2015,7 +2015,7 @@ def _to_cudf(self, cudf: Any, mask: Content | None, length: int):
         index = self._offsets.raw(cupy).astype("int32")
         buf = cudf.core.buffer.as_buffer(index)
 
-        if parse_version(cupy._version.__version__) >= parse_version("24.10.00"):
+        if parse_version(cudf.__version__) >= parse_version("24.10.00"):
             ind_buf = cudf.core.column.numerical.NumericalColumn(
                 data=buf, dtype=index.dtype, mask=None, size=len(index)
             )
@@ -2042,13 +2042,21 @@ def _to_cudf(self, cudf: Any, mask: Content | None, length: int):
                 mask=m,
             )
 
-        return cudf.core.column.lists.ListColumn(
-            size=length,
-            data=None,
-            mask=m,
-            children=(ind_buf, cont),
-            dtype=cudf.core.dtypes.ListDtype(cont.dtype),
-        )
+        if parse_version(cudf.__version__) >= parse_version("24.10.00"):
+            return cudf.core.column.lists.ListColumn(
+                size=length,
+                data=None,
+                mask=m,
+                children=(ind_buf, cont),
+                dtype=cudf.core.dtypes.ListDtype(cont.dtype),
+            )
+        else:
+            return cudf.core.column.lists.ListColumn(
+                length,
+                mask=m,
+                children=(ind_buf, cont),
+                dtype=cudf.core.dtypes.ListDtype(cont.dtype),
+            )
 
     def _to_backend_array(self, allow_missing, backend):
         array_param = self.parameter("__array__")