From 457d68256d8bf322a5736b3bc891fb6befdc1cbc Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Mon, 9 Feb 2026 09:27:20 -0600
Subject: [PATCH] Keep early guard to avoid stack buffer allocation

---
 esphome/components/nextion/nextion.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/esphome/components/nextion/nextion.cpp b/esphome/components/nextion/nextion.cpp
index 56bbc840fb..74e453e028 100644
--- a/esphome/components/nextion/nextion.cpp
+++ b/esphome/components/nextion/nextion.cpp
@@ -397,8 +397,12 @@ bool Nextion::remove_from_q_(bool report_empty) {
 }
 
 void Nextion::process_serial_() {
-  // Read all available bytes in batches to reduce UART call overhead.
   int avail = this->available();
+  if (avail <= 0) {
+    return;
+  }
+
+  // Read all available bytes in batches to reduce UART call overhead.
   uint8_t buf[64];
   while (avail > 0) {
     size_t to_read = std::min(static_cast<size_t>(avail), sizeof(buf));