diff --git a/pkg/modules/migration/create_from_structure.go b/pkg/modules/migration/create_from_structure.go
index b63a6c03dcb..c11e474b0ee 100644
--- a/pkg/modules/migration/create_from_structure.go
+++ b/pkg/modules/migration/create_from_structure.go
@@ -60,6 +60,7 @@ func insertFromStructure(s *xorm.Session, str []*models.ProjectWithTasksAndBucke
 
 		if p.ParentProjectID != 0 {
 			childRelations[p.ParentProjectID] = append(childRelations[p.ParentProjectID], oldID)
+			p.ParentProjectID = 0
 		}
 
 		p.ID = 0