add try catch to setTerrain

website/src/lib/components/map/map.ts

@@ -212,6 +212,7 @@ export class MapboxGLMap {
         const map = get(this._map);
         if (map) {
             const source = get(terrainSource);
+            try {
                 if (!map.getSource(source)) {
                     map.addSource(source, terrainSources[source]);
                 }
@@ -223,6 +224,10 @@ export class MapboxGLMap {
                 } else {
                     map.setTerrain(null);
                 }
+            } catch (e) {
+                // No reliable way to check if the map is ready to add sources and layers
+                return;
+            }
         }
     }
 }