From e1605ef47583f588a21a3c7825b966f5bb4695e5 Mon Sep 17 00:00:00 2001
From: Hans Then <hans.then@gmail.com>
Date: Fri, 18 Apr 2025 09:38:07 +0200
Subject: [PATCH] Special case null values in popup and tooltip

---
 folium/features.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/folium/features.py b/folium/features.py
index 1c18f426db..8bcd0e2a27 100644
--- a/folium/features.py
+++ b/folium/features.py
@@ -1108,7 +1108,15 @@ class GeoJsonDetail(MacroElement):
     function(layer){
     let div = L.DomUtil.create('div');
     {% if this.fields %}
-    let handleObject = feature=>typeof(feature)=='object' ? JSON.stringify(feature) : feature;
+    let handleObject = feature => {
+        if (feature === null) {
+            return '';
+        } else if (typeof(feature)=='object') {
+            return JSON.stringify(feature);
+        } else {
+            return feature;
+        }
+    }
     let fields = {{ this.fields | tojson | safe }};
     let aliases = {{ this.aliases | tojson | safe }};
     let table = '<table>' +