From a7c1f7ba69a1ce7262d41c73efe3eb07cb5189ee Mon Sep 17 00:00:00 2001
From: Andrey Antukh <niwi@niwi.nz>
Date: Fri, 11 Apr 2025 08:54:02 +0200
Subject: [PATCH] :bug: Fix incorrect undo handling on path edition

---
 CHANGES.md                                 | 3 ++-
 common/src/app/common/data/undo_stack.cljc | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/CHANGES.md b/CHANGES.md
index ec306c8829..6c020ebb18 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,11 +1,12 @@
 # CHANGELOG
 
-## 2.6.2
+## 2.6.2 (Unreleased)
 
 ### :bug: Bugs fixed
 
 - Increase the height of the right sidebar dropdowns [Taiga #10615](https://tree.taiga.io/project/penpot/issue/10615)
 - Fix scroll on token themes modal [Taiga #10745](https://tree.taiga.io/project/penpot/issue/10745)
+- Fix unexpected exception on path editor on merge segments when undo stack is empty
 
 ## 2.6.1
 
diff --git a/common/src/app/common/data/undo_stack.cljc b/common/src/app/common/data/undo_stack.cljc
index 61117cb2ee..dbcae0db14 100644
--- a/common/src/app/common/data/undo_stack.cljc
+++ b/common/src/app/common/data/undo_stack.cljc
@@ -47,7 +47,7 @@
 
 (defn undo
   [stack]
-  (update stack :index dec))
+  (update stack :index #(max 0 (dec %))))
 
 (defn redo
   [{index :index items :items :as stack}]