diff --git a/rma/models/stock_rule.py b/rma/models/stock_rule.py
index 2efe0c96..244e8419 100644
--- a/rma/models/stock_rule.py
+++ b/rma/models/stock_rule.py
@@ -32,7 +32,7 @@ class StockRule(models.Model):
         if "rma_line_id" in values:
             line = values.get("rma_line_id")
             line = self.env["rma.order.line"].browse([line])
-        elif "group_id" in values:
+        elif "group_id" in values and values["group_id"]:
             pg = values["group_id"]
             line = pg.rma_line_id
         if line: