Don't crash when clicking a feature in a layer group which didn't opt in for popover.

Such as `adm.*`.

1 files changed, 1 insertions, 1 deletions

diff --git a/main.js b/main.js
index ff7dec9..49df160 100644
--- a/main.js
+++ b/main.js
@@ -5305,7 +5305,7 @@ const disposePopover = (function() {
       const layerGroup = layer.get('layerGroup');
       const layerName = feature.getProperties().layer;
       mapSources[layerGroup] ??= layer.getSource();
-      const def = layerName != null ? layers[layerGroup][layerName] : null;
+      const def = layerName != null ? layers[layerGroup]?.[layerName] : null;
       if (def?.fields == null) {
         /* skip layers which didn't opt-in for popover */
         return false;