From 2d1f2217e506b7cd116b712e2ce4dd32d7fc012f Mon Sep 17 00:00:00 2001
From: AJ Isaacs <ajisaacs27@gmail.com>
Date: Fri, 20 Mar 2026 14:43:51 -0400
Subject: [PATCH] fix: guard IsHandleCreated in EditNestForm timer

Prevent InvalidOperationException when the timer fires before or
after the control handle is available.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 OpenNest/Forms/EditNestForm.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/OpenNest/Forms/EditNestForm.cs b/OpenNest/Forms/EditNestForm.cs
index 8d39961..3f01578 100644
--- a/OpenNest/Forms/EditNestForm.cs
+++ b/OpenNest/Forms/EditNestForm.cs
@@ -774,6 +774,9 @@ namespace OpenNest.Forms
 
         private void drawingListUpdateTimer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
         {
+            if (!drawingListBox1.IsHandleCreated)
+                return;
+
             drawingListBox1.Invoke(new MethodInvoker(() =>
             {
                 drawingListBox1.Refresh();