From 55963a6ea05373c0a28caa7752bdc3780968b6b0 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 27 Mar 2026 15:53:18 -1000
Subject: [PATCH] [sensor] Assert size before writing, not after

---
 esphome/components/sensor/filter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/esphome/components/sensor/filter.h b/esphome/components/sensor/filter.h
index c6609bd1fbf..a3bd7b6b511 100644
--- a/esphome/components/sensor/filter.h
+++ b/esphome/components/sensor/filter.h
@@ -506,11 +506,11 @@ optional<float> calibrate_polynomial_compute(const float *coefficients, size_t c
 template<size_t N> class CalibratePolynomialFilter : public Filter {
  public:
   explicit CalibratePolynomialFilter(std::initializer_list<float> coefficients) {
+    ESPHOME_DEBUG_ASSERT(coefficients.size() == N);
     size_t i = 0;
     for (float c : coefficients) {
       this->coefficients_[i++] = c;
     }
-    ESPHOME_DEBUG_ASSERT(i == N);
   }
   optional<float> new_value(float value) override {
     return calibrate_polynomial_compute(this->coefficients_.data(), N, value);