diff --git a/redash/models/__init__.py b/redash/models/__init__.py
index f3483bfa3a..063ced3e62 100644
--- a/redash/models/__init__.py
+++ b/redash/models/__init__.py
@@ -968,9 +968,9 @@ def get_by_id_and_org(cls, object_id, org):
         return super(Alert, cls).get_by_id_and_org(object_id, org, Query)
 
     def evaluate(self):
-        data = self.query_rel.latest_query_data.data
+        data = self.query_rel.latest_query_data.data if self.query_rel.latest_query_data else None
 
-        if data["rows"] and self.options["column"] in data["rows"][0]:
+        if data and data["rows"] and self.options["column"] in data["rows"][0]:
             op = OPERATORS.get(self.options["op"], lambda v, t: False)
 
             if "selector" not in self.options:
diff --git a/tests/models/test_alerts.py b/tests/models/test_alerts.py
index 3bcfff0108..6c614db096 100644
--- a/tests/models/test_alerts.py
+++ b/tests/models/test_alerts.py
@@ -111,6 +111,13 @@ def test_evaluates_correctly_with_max_selector(self):
         alert.options["selector"] = "max"
         self.assertEqual(alert.evaluate(), Alert.UNKNOWN_STATE)
 
+    def test_evaluate_alerts_without_query_rel(self):
+        query = self.factory.create_query(latest_query_data_id=None)
+        alert = self.factory.create_alert(
+            query_rel=query, options={"selector": "first", "op": "equals", "column": "foo", "value": "1"}
+        )
+        self.assertEqual(alert.evaluate(), Alert.UNKNOWN_STATE)
+
 
 class TestNextState(TestCase):
     def test_numeric_value(self):