diff --git a/InvenTree/script/translation_stats.py b/InvenTree/script/translation_stats.py
index 2b0e8d639c..4ee83120eb 100644
--- a/InvenTree/script/translation_stats.py
+++ b/InvenTree/script/translation_stats.py
@@ -72,7 +72,7 @@ if __name__ == '__main__':
 
         if verbose:
             print(f"| {locale.ljust(4, ' ')} : {str(percentage).rjust(4, ' ')}% |")
-    
+
         locales_perc[locale] = percentage
 
         percentages.append(percentage)
@@ -89,4 +89,4 @@ if __name__ == '__main__':
     else:
         avg = 0
 
-    print(f"InvenTree translation coverage: {avg}%")
\ No newline at end of file
+    print(f"InvenTree translation coverage: {avg}%")
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index 48db47ba0d..d302b1676c 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -1166,6 +1166,9 @@ class StockItem(MPTTModel):
             if self.belongs_to:
                 raise ValidationError(_('Stock item is installed in another item'))
 
+            if self.installed_item_count() > 0:
+                raise ValidationError(_('Stock item contains other items'))
+
             if self.customer:
                 raise ValidationError(_('Stock item has been assigned to a customer'))