diff --git a/markers.js b/markers.js
index 75bfd80..8fc0632 100644
--- a/markers.js
+++ b/markers.js
@@ -20,10 +20,20 @@ async function GetMarkerData() {
 
 
 function RenderMarkers(data){
-  array.forEach(data => {
-    var marker = L.marker([data.X, data.Y]).addTo(map);
-  });
+  if (!Array.isArray(rows)) {
+    console.error('Erwarte ein Array, bekam:', rows);
+    return;
+  }
 
+  rows.forEach((row) => {
+    const x = Number(row.X);
+    const y = Number(row.Y);
+    if (!Number.isFinite(x) || !Number.isFinite(y)) return;
+
+    L.marker([y, x])        // [lat, lng] -> [Y, X]
+      .addTo(map)
+      .bindPopup(`<b>${row.Name ?? ''}</b>`);
+  });
 }