fix for dx visualizer

public/index.html

@@ -1630,12 +1630,20 @@
         // Add new DX paths if enabled
         if (showDXPaths && dxPaths && dxPaths.length > 0) {
           dxPaths.forEach((path, index) => {
+            try {
+              // Skip if missing or invalid coordinates
+              if (!path.spotterLat || !path.spotterLon || !path.dxLat || !path.dxLon) return;
+              if (isNaN(path.spotterLat) || isNaN(path.spotterLon) || isNaN(path.dxLat) || isNaN(path.dxLon)) return;
+              
               // Draw great circle line from spotter to DX station
               const pathPoints = getGreatCirclePoints(
                 path.spotterLat, path.spotterLon,
                 path.dxLat, path.dxLon
               );
               
+              // Skip if no valid path points
+              if (!pathPoints || !Array.isArray(pathPoints) || pathPoints.length === 0) return;
+              
               // Use different colors based on band (derived from frequency)
               const freq = parseFloat(path.freq);
               let color = '#4488ff'; // Default blue
@@ -1650,15 +1658,20 @@
               else if (freq >= 28 && freq < 30) color = '#9966ff'; // 10m - purple
               else if (freq >= 50 && freq < 54) color = '#ff66ff'; // 6m - magenta
               
-            // Handle antimeridian crossing
-            const segments = Array.isArray(pathPoints[0]) ? pathPoints : [pathPoints];
+              // Handle antimeridian crossing - pathPoints may be array of segments or single segment
+              // Check if first element's first element is an array (segment structure) vs just [lat, lon]
+              const isSegmented = Array.isArray(pathPoints[0]) && pathPoints[0].length > 0 && Array.isArray(pathPoints[0][0]);
+              const segments = isSegmented ? pathPoints : [pathPoints];
+              
               segments.forEach(segment => {
+                if (segment && Array.isArray(segment) && segment.length > 1) {
                   const line = L.polyline(segment, {
                     color: color,
                     weight: 1.5,
                     opacity: 0.5
                   }).addTo(map);
                   dxPathsLinesRef.current.push(line);
+                }
               });
 
               // Add small markers at DX station end only (to reduce clutter)
@@ -1681,6 +1694,9 @@
                 `)
                 .addTo(map);
               dxPathsMarkersRef.current.push(marker);
+            } catch (err) {
+              console.error('[DX Paths] Error rendering path:', err, path);
+            }
           });
         }
       }, [dxPaths, showDXPaths]);