diff --git a/cmd/migrate/danke_v3.go b/cmd/migrate/danke_v3.go
index b0ec373..68760e4 100644
--- a/cmd/migrate/danke_v3.go
+++ b/cmd/migrate/danke_v3.go
@@ -239,10 +239,13 @@ where true`).Error
 		}
 
 		// update course_group.course_count, course_group.credits
-		err = tx.Exec(`update course_group 
-set course_count = (select count(*) from course where course.course_group_id = course_group.id)
-    credits = (select concat('[', group_concat(distinct credit), ']') from course group by course_group_id);
+		err = tx.Exec(`update course_group
+set course_count = (select count(*) from course where course.course_group_id = course_group.id),
+    credits = (select concat('[', group_concat(distinct credit), ']') from course where course_group_id = course_group.id)
 where true`).Error
+		if err != nil {
+			return err
+		}
 
 		if m.HasColumn(&model.Review{}, "upvoters") {
 			err = m.DropColumn(&model.Review{}, "upvoters")