From 787af59845000a62889446868c0cadd811be94a5 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Fri, 27 Mar 2026 15:55:29 -1000
Subject: [PATCH] [text_sensor] Assert size before writing, not after

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

diff --git a/esphome/components/text_sensor/filter.h b/esphome/components/text_sensor/filter.h
index f4bb0228c57..ae3307f5ed2 100644
--- a/esphome/components/text_sensor/filter.h
+++ b/esphome/components/text_sensor/filter.h
@@ -131,11 +131,11 @@ bool substitute_filter_apply(const Substitution *substitutions, size_t count, st
 template<size_t N> class SubstituteFilter : public Filter {
  public:
   explicit SubstituteFilter(const std::initializer_list<Substitution> &substitutions) {
+    ESPHOME_DEBUG_ASSERT(substitutions.size() == N);
     size_t i = 0;
     for (const auto &s : substitutions) {
       this->substitutions_[i++] = s;
     }
-    ESPHOME_DEBUG_ASSERT(i == N);
   }
   bool new_value(std::string &value) override { return substitute_filter_apply(this->substitutions_.data(), N, value); }