diff --git a/models/mrp_production.py b/models/mrp_production.py
index 0d4c12e..9e1ab41 100644
--- a/models/mrp_production.py
+++ b/models/mrp_production.py
@@ -164,6 +164,8 @@ class MrpProduction(models.Model):
                     # Only auto-fix if it's a microscopic rounding drift (not a user overriding quantity intentionally)
                     if 0.000001 < abs(diff) < (move.product_uom.rounding * 1.5):
                         for ml in move.move_line_ids:
+                            if not ml.product_id:
+                                continue
                             # Safely apply the tiny difference to the first line that has enough quantity
                             if ml.quantity and ml.quantity + diff >= 0:
                                 ml.quantity += diff
@@ -176,6 +178,8 @@ class MrpProduction(models.Model):
                     diff = clean_total - total_done
                     if 0.000001 < abs(diff) < (move.product_uom.rounding * 1.5):
                         for ml in move.move_line_ids:
+                            if not ml.product_id:
+                                continue
                             if ml.quantity and ml.quantity + diff >= 0:
                                 ml.quantity += diff
                                 break