diff --git a/src/lib/ClusterableVectorTileSourceProxy.ts b/src/lib/ClusterableVectorTileSourceProxy.ts
index b82fb5e..52247a7 100644
--- a/src/lib/ClusterableVectorTileSourceProxy.ts
+++ b/src/lib/ClusterableVectorTileSourceProxy.ts
@@ -19,10 +19,11 @@ class ClusterableVectorTileSourceProxy {
         this.resolution = resolution;
         if (this.extent === undefined || !equals(this.extent, extent)) {
           this.extent = extent;
-          if (target.getProjection() != null) {
+          const projection = target.getProjection();
+          if (projection != null) {
             this.extentProjected = fromLonLat(
               extent.slice(0, 2),
-              target.getProjection()
+              projection
             ).concat(fromLonLat(extent.slice(2), this.projection));
           }
         }
@@ -48,7 +49,6 @@ class ClusterableVectorTileSourceProxy {
           this.extentProjected !== undefined
             ? target.getFeaturesInExtent(this.extentProjected)
             : [];
-        //console.trace();
         this.featuresSent = true;
         //   console.log({
         //     caller: 'clusterableVectorTileSourceProxy',
@@ -80,6 +80,7 @@ class ClusterableVectorTileSourceProxy {
 
   constructor(options: Options) {
     const { source } = options;
+    // @ts-ignore
     this.proxy = new Proxy(source, {
       get: (target, prop, receiver) => {
         let result;
@@ -99,6 +100,7 @@ class ClusterableVectorTileSourceProxy {
         return result;
       },
     });
+    //@ts-ignore
     return this.proxy;
   }
 }