diff --git a/prisma/schema.prisma b/prisma/schema.prisma
index 5610974..fd96b18 100644
--- a/prisma/schema.prisma
+++ b/prisma/schema.prisma
@@ -1466,7 +1466,7 @@ model RequestWorkStepStatus {
   responsibleUserId    String?
   responsibleUser      User?    @relation(fields: [responsibleUserId], references: [id])
 
-  taskOrder   TaskOrder? @relation(fields: [taskOrderId], references: [id])
+  taskOrder   TaskOrder? @relation(fields: [taskOrderId], references: [id], onDelete: SetNull)
   taskOrderId String?
 
   @@id([step, requestWorkId])