diff --git a/query.go b/query.go
index 77ee6db..eb3d7dd 100644
--- a/query.go
+++ b/query.go
@@ -24,7 +24,7 @@ func queryEvents(filter *filter.EventFilter) (events []event.Event, err error) {
 		params = append(params, filter.Author)
 	}
 
-	if filter.Kind != 0 {
+	if filter.Kind != nil && *filter.Kind != 0 {
 		conditions = append(conditions, "kind = ?")
 		params = append(params, filter.Kind)
 	}