diff --git a/db/routines/R__063_fn_load_planning_slots_full.sql b/db/routines/R__063_fn_load_planning_slots_full.sql
index e899f6e..4cbbe51 100644
--- a/db/routines/R__063_fn_load_planning_slots_full.sql
+++ b/db/routines/R__063_fn_load_planning_slots_full.sql
@@ -21,7 +21,7 @@ returns table (
   allow_discharge_export boolean
 )
 language plpgsql
-stable
+volatile
 as $fn$
 declare
   v_charge_buf numeric;
diff --git a/frontend/src/pages/Planning.tsx b/frontend/src/pages/Planning.tsx
index 5cbc8c2..aa6d386 100644
--- a/frontend/src/pages/Planning.tsx
+++ b/frontend/src/pages/Planning.tsx
@@ -569,7 +569,7 @@ export default function Planning() {
       await postRunPlan(siteId, 'rolling')
       await load()
     } catch (e) {
-      setError(e instanceof Error ? e.message : 'Přepočet selhal')
+      setError(axiosDetail(e) || 'Přepočet selhal')
     } finally {
       setReplanning(false)
     }