diff --git a/overlord/src/app/product/product-detail/product-detail.component.ts b/overlord/src/app/product/product-detail/product-detail.component.ts
index a0697256..5102063b 100644
--- a/overlord/src/app/product/product-detail/product-detail.component.ts
+++ b/overlord/src/app/product/product-detail/product-detail.component.ts
@@ -128,7 +128,7 @@ export class ProductDetailComponent implements OnInit, AfterViewInit {
     this.item.isPurchased = formModel.isPurchased;
     this.item.isSold = formModel.isSold;
     this.item.isActive = formModel.isActive;
-    if (this.item.productGroup === undefined) {
+    if (this.item.productGroup === null || this.item.productGroup === undefined) {
       this.item.productGroup = new ProductGroup();
     }
     this.item.productGroup.id = formModel.productGroup;