diff --git a/app.js b/app.js
index 2954e55..431eaea 100644
--- a/app.js
+++ b/app.js
@@ -192,7 +192,7 @@ document.addEventListener('DOMContentLoaded', async () => {
 
         let blfCoords, ksfCoords, mfParts;
 
-        if (hersteller === 'Nordex') {
+        if (hersteller && hersteller.toLowerCase() === 'nordex') {
             // Nordex Geometries (Based on technical drawing: Tower is not centered in KSF width)
             // Foundation: R=5.5
             // KSF: 59.65m (L) x 36.50m (B). 
@@ -1930,16 +1930,28 @@ document.addEventListener('DOMContentLoaded', async () => {
                     state.turbines = [];
 
                     dbTurbines.forEach(t => {
-                        const latlng = L.latLng(t.lat, t.lng);
-                        createTurbine(latlng, null, {
-                            nr: t.nr,
-                            hersteller: t.hersteller,
-                            type: t.type,
-                            rd: t.rd,
-                            hh: t.hh,
-                            ksfAngle: t.ksfangle ?? t.ksfAngle ?? 0,
-                            variant: t.variant
-                        });
+                        try {
+                            const latlng = L.latLng(t.lat, t.lng);
+                            const variant = t.variant || 'A';
+                            
+                            // Check if variant layer exists
+                            if (!variantLayers[variant]) {
+                                console.warn(`WEA ${t.nr} hat ungültige Variante: ${variant}. Überspringe.`);
+                                return;
+                            }
+
+                            createTurbine(latlng, null, {
+                                nr: t.nr,
+                                hersteller: t.hersteller,
+                                type: t.type,
+                                rd: t.rd,
+                                hh: t.hh,
+                                ksfAngle: t.ksfangle ?? t.ksfAngle ?? 0,
+                                variant: variant
+                            });
+                        } catch (e) {
+                            console.error(`Fehler beim Laden von WEA ${t.nr}:`, e);
+                        }
                     });
                     statusEl.innerText = `${dbTurbines.length} WEAs aus Datenbank geladen.`;
                 } else {