diff --git a/assets/index.html b/assets/index.html
index f756d47..3c1fe56 100644
--- a/assets/index.html
+++ b/assets/index.html
@@ -263,21 +263,26 @@
 
             const airplane = new Airplane();
             addLog('Airplane created, vertices: ' + airplane.vertices.length);
-
-            function animate() {
+function animate() {
                 try {
-                        ctx.fillStyle = '#000';
-                        ctx.fillRect(0, 0, width, height);
+                    addLog('FRAME start');
+                    ctx.fillStyle = '#000';
+                    ctx.fillRect(0, 0, width, height);
 
-                        landscape.update();
-                        landscape.draw();
+                    addLog('before landscape.update');
+                    landscape.update();
+                    addLog('before landscape.draw');
+                    landscape.draw();
 
-                        airplane.update();
-                        airplane.render();
-                    } catch (err) {
-                        addLog('ANIM ERR: ' + err.message + ' at line ' + (err.lineNumber || '?'));
-                        return;
-                    }
+                    addLog('before airplane.update');
+                    airplane.update();
+                    addLog('before airplane.render');
+                    airplane.render();
+                    addLog('FRAME end');
+                } catch (err) {
+                    addLog('ANIM ERR: ' + err.message + ' at line ' + (err.lineNumber || '?') + ' stack: ' + (err.stack || ''));
+                    return;
+                }
                 requestAnimationFrame(animate);
             }