diff --git a/superset/db_engine_specs/base.py b/superset/db_engine_specs/base.py
index f1a46ceb3..fb76d9363 100644
--- a/superset/db_engine_specs/base.py
+++ b/superset/db_engine_specs/base.py
@@ -704,7 +704,7 @@ class BaseEngineSpec:  # pylint: disable=too-many-public-methods
         time_grain_expressions.update(grain_addon_expressions.get(cls.engine, {}))
         denylist: List[str] = current_app.config["TIME_GRAIN_DENYLIST"]
         for key in denylist:
-            time_grain_expressions.pop(key)
+            time_grain_expressions.pop(key, None)
 
         return dict(
             sorted(
diff --git a/tests/integration_tests/db_engine_specs/base_engine_spec_tests.py b/tests/integration_tests/db_engine_specs/base_engine_spec_tests.py
index 87de98db1..6048ac8f1 100644
--- a/tests/integration_tests/db_engine_specs/base_engine_spec_tests.py
+++ b/tests/integration_tests/db_engine_specs/base_engine_spec_tests.py
@@ -332,11 +332,12 @@ def test_is_readonly():
 
 def test_time_grain_denylist():
     config = app.config.copy()
-    app.config["TIME_GRAIN_DENYLIST"] = ["PT1M"]
+    app.config["TIME_GRAIN_DENYLIST"] = ["PT1M", "SQLITE_NONEXISTENT_GRAIN"]
 
     with app.app_context():
         time_grain_functions = SqliteEngineSpec.get_time_grain_expressions()
         assert not "PT1M" in time_grain_functions
+        assert not "SQLITE_NONEXISTENT_GRAIN" in time_grain_functions
 
     app.config = config