From bd9f6901076a1c596e6c2a1c4b4f68cb0fe1f1ac Mon Sep 17 00:00:00 2001
From: andig <cpuidle@gmail.com>
Date: Wed, 22 Apr 2026 20:08:21 +0200
Subject: [PATCH] Optimizer: fix panic in prorate

---
 core/site_optimizer.go | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/core/site_optimizer.go b/core/site_optimizer.go
index d8686c471..ac4a658ce 100644
--- a/core/site_optimizer.go
+++ b/core/site_optimizer.go
@@ -559,6 +559,11 @@ func profileSlotsFromNow(profile []float64) []float64 {
 
 // prorate adjusts the first slot's energy amount according to remaining duration
 func prorate[T constraints.Float](slots []T, firstSlotDuration time.Duration) []float32 {
+	// return empty slice instead of nil to make api happy
+	if len(slots) == 0 {
+		return []float32{}
+	}
+
 	res := slices.Clone(slots)
 	res[0] = res[0] * T(firstSlotDuration) / T(tariff.SlotDuration)
 	return lo.Map(res, func(f T, _ int) float32 {