diff --git a/schema/constraint_reference.go b/schema/constraint_reference.go
index 23ce078d..3474fbe5 100644
--- a/schema/constraint_reference.go
+++ b/schema/constraint_reference.go
@@ -66,8 +66,11 @@ func (ref Reference) Copy() Constraint {
 }
 
 func (ref Reference) EmptyCompletionData(nextPlaceholder int) CompletionData {
-	// TODO
-	return CompletionData{}
+	return CompletionData{
+		NewText:        "",
+		Snippet:        "",
+		TriggerSuggest: true,
+	}
 }
 
 func (ref Reference) Validate() error {