From a72837704c4cdd8765d9bef1ec058741cef38b27 Mon Sep 17 00:00:00 2001
From: "J. Nick Koston" <nick@home-assistant.io>
Date: Sun, 2 Nov 2025 20:04:37 -0600
Subject: [PATCH] fix trigge on preset mode cleared

---
 esphome/components/fan/automation.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/esphome/components/fan/automation.h b/esphome/components/fan/automation.h
index 48de8d66fbd..ae0af1a9bd3 100644
--- a/esphome/components/fan/automation.h
+++ b/esphome/components/fan/automation.h
@@ -215,8 +215,9 @@ class FanPresetSetTrigger : public Trigger<std::string> {
       const auto *preset_mode = state->get_preset_mode();
       auto should_trigger = preset_mode != this->last_preset_mode_;
       this->last_preset_mode_ = preset_mode;
-      if (should_trigger && preset_mode != nullptr) {
-        this->trigger(preset_mode);
+      if (should_trigger) {
+        // Trigger with empty string when nullptr to maintain backward compatibility
+        this->trigger(preset_mode != nullptr ? preset_mode : "");
       }
     });
     this->last_preset_mode_ = state->get_preset_mode();