From f94ac8097ce8a576a6f29faef10371f5a9951218 Mon Sep 17 00:00:00 2001
From: Graham McIntire <graham@mcintire.me>
Date: Sat, 25 Oct 2025 12:08:31 -0500
Subject: [PATCH] Add explicit NaN checks to trail coordinate validation

Add isNaN() checks in addition to isFinite() to catch NaN values before
they reach Leaflet's polyline renderer. This prevents 'can't access
property x, h is undefined' errors when invalid coordinates slip through.

Generated with Claude Code https://claude.com/claude-code
---
 assets/js/features/trail_manager.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/assets/js/features/trail_manager.ts b/assets/js/features/trail_manager.ts
index 814612b..20d1be6 100644
--- a/assets/js/features/trail_manager.ts
+++ b/assets/js/features/trail_manager.ts
@@ -109,6 +109,8 @@ export class TrailManager {
     if (
       typeof lat !== 'number' ||
       typeof lng !== 'number' ||
+      isNaN(lat) ||
+      isNaN(lng) ||
       !isFinite(lat) ||
       !isFinite(lng) ||
       lat < -90 ||
@@ -278,6 +280,8 @@ export class TrailManager {
             pos &&
             typeof pos.lat === 'number' &&
             typeof pos.lng === 'number' &&
+            !isNaN(pos.lat) &&
+            !isNaN(pos.lng) &&
             isFinite(pos.lat) &&
             isFinite(pos.lng) &&
             pos.lat >= -90 &&