diff --git a/app.py b/app.py
index 264fed0..b2cddad 100644
--- a/app.py
+++ b/app.py
@@ -511,6 +511,7 @@ def formularz_zbiorek(zbiorka_id=None):
             zb.pokaz_postep_kwotowo = pokaz_postep_kwotowo
             
             zb.przedmioty.clear()
+            db.session.flush()
             
             for i, raw_name in enumerate(names):
                 name = (raw_name or "").strip()