diff --git a/query_executors/memory_executor/memory_executor.go b/query_executors/memory_executor/memory_executor.go
index 2d049e5..6c5c460 100644
--- a/query_executors/memory_executor/memory_executor.go
+++ b/query_executors/memory_executor/memory_executor.go
@@ -670,6 +670,14 @@ func hasAggregateFunctions(selectItems []parsers.SelectItem) bool {
 }
 
 func compareValues(val1, val2 interface{}) int {
+	if val1 == nil && val2 == nil {
+		return 0
+	} else if val1 == nil {
+		return -1
+	} else if val2 == nil {
+		return 1
+	}
+
 	if reflect.TypeOf(val1) != reflect.TypeOf(val2) {
 		return 1
 	}
diff --git a/query_executors/memory_executor/select_test.go b/query_executors/memory_executor/select_test.go
index 3b9e83d..331723b 100644
--- a/query_executors/memory_executor/select_test.go
+++ b/query_executors/memory_executor/select_test.go
@@ -10,10 +10,10 @@ import (
 
 func Test_Execute_Select(t *testing.T) {
 	mockData := []memoryexecutor.RowType{
-		map[string]interface{}{"id": "12345", "pk": 123, "_self": "self1", "_rid": "rid1", "_ts": 123456, "isCool": false, "order": 1},
-		map[string]interface{}{"id": "67890", "pk": 456, "_self": "self2", "_rid": "rid2", "_ts": 789012, "isCool": true, "order": 2},
-		map[string]interface{}{"id": "456", "pk": 456, "_self": "self2", "_rid": "rid2", "_ts": 789012, "isCool": true, "order": 3},
-		map[string]interface{}{"id": "123", "pk": 456, "_self": "self2", "_rid": "rid2", "_ts": 789012, "isCool": true, "order": 4},
+		map[string]interface{}{"id": "12345", "pk": 123, "_self": "self1", "_rid": "rid1", "_ts": 123456, "isCool": false, "order": nil},
+		map[string]interface{}{"id": "67890", "pk": 456, "_self": "self2", "_rid": "rid2", "_ts": 789012, "isCool": true, "order": 1},
+		map[string]interface{}{"id": "456", "pk": 456, "_self": "self2", "_rid": "rid2", "_ts": 789012, "isCool": true, "order": 2},
+		map[string]interface{}{"id": "123", "pk": 456, "_self": "self2", "_rid": "rid2", "_ts": 789012, "isCool": true, "order": 3},
 	}
 
 	t.Run("Should execute simple SELECT", func(t *testing.T) {