From a67b85eabf4f584ef4a7d136bee5f04421d8defe Mon Sep 17 00:00:00 2001
From: Samuel Sieb <samuel-github@sieb.net>
Date: Sat, 15 Feb 2025 23:02:51 -0800
Subject: [PATCH] don't crash on null pages (#8254)

Co-authored-by: Samuel Sieb <samuel@sieb.net>
---
 esphome/components/display/display.cpp | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/esphome/components/display/display.cpp b/esphome/components/display/display.cpp
index 202c64ef14..b12a81e050 100644
--- a/esphome/components/display/display.cpp
+++ b/esphome/components/display/display.cpp
@@ -815,8 +815,20 @@ void Display::test_card() {
 
 DisplayPage::DisplayPage(display_writer_t writer) : writer_(std::move(writer)) {}
 void DisplayPage::show() { this->parent_->show_page(this); }
-void DisplayPage::show_next() { this->next_->show(); }
-void DisplayPage::show_prev() { this->prev_->show(); }
+void DisplayPage::show_next() {
+  if (this->next_ == nullptr) {
+    ESP_LOGE(TAG, "no next page");
+    return;
+  }
+  this->next_->show();
+}
+void DisplayPage::show_prev() {
+  if (this->prev_ == nullptr) {
+    ESP_LOGE(TAG, "no previous page");
+    return;
+  }
+  this->prev_->show();
+}
 void DisplayPage::set_parent(Display *parent) { this->parent_ = parent; }
 void DisplayPage::set_prev(DisplayPage *prev) { this->prev_ = prev; }
 void DisplayPage::set_next(DisplayPage *next) { this->next_ = next; }