diff --git a/rest_framework_mvt/managers.py b/rest_framework_mvt/managers.py
index a7ad065..196cfa7 100644
--- a/rest_framework_mvt/managers.py
+++ b/rest_framework_mvt/managers.py
@@ -57,7 +57,7 @@ def _get_non_geom_columns(self):
         for field in self.model._meta.get_fields():
             if hasattr(field, "get_attname_column"):
                 column_name = field.get_attname_column()[1]
-                if column_name != self.geo_col:
+                if column_name and column_name != self.geo_col:
                     columns.append(column_name)
         return columns
 
diff --git a/test/unit/test_mvt_manager.py b/test/unit/test_mvt_manager.py
index 88d4704..503a0b0 100644
--- a/test/unit/test_mvt_manager.py
+++ b/test/unit/test_mvt_manager.py
@@ -36,6 +36,9 @@ def mvt_manager_no_col():
             get_attname_column=MagicMock(return_value=("jazzy_geo", "jazzy_geo"))
         ),
         MagicMock(get_attname_column=MagicMock(return_value=("city", "city"))),
+        MagicMock(
+            get_attname_column=MagicMock(return_value=("generic_relation", None))
+        ),
     ]
     meta.get_fields.return_value = fields
     mvt_manager_no_col.model = MagicMock(_meta=meta)
@@ -99,6 +102,7 @@ def test_mvt_manager_build_query__no_geo_col(get_conn, only, mvt_manager_no_col)
 
     assert expected_query == query
     assert expected_parameters == parameters
+    only.assert_called_once_with("other_column", "jazzy_geo", "city")
 
 
 @patch("rest_framework_mvt.managers.MVTManager.filter")