diff --git a/src/dodo.schema b/src/dodo.schema
index 88ac3be..a62c708 100644
--- a/src/dodo.schema
+++ b/src/dodo.schema
@@ -18,7 +18,7 @@ CREATE TABLE tasks(
 CREATE TRIGGER autoinc_active_id
 AFTER INSERT ON tasks
 BEGIN
-	UPDATE tasks SET active_id = (SELECT COALESCE((SELECT MAX(active_id) FROM tasks) + 1, 1)) WHERE task_id=NEW.task_id;
+	UPDATE tasks SET active_id = (SELECT COALESCE((SELECT MAX(active_id) FROM tasks WHERE active_id!='NULL') + 1, 1)) WHERE task_id=NEW.task_id;
 
 END;