OrbitControls.js._handleTouchMoveDolly() error "Cannot read properties of undefined (reading 'x')"

[andreasrosdal]

Description

This Javascript error in OrbitControls.js occurs frequently on www.freecivx.net running Three.js r173.

Uncaught TypeError: Cannot read properties of undefined (reading 'x') Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

https://github.com/mrdoob/three.js/blob/dev/examples/jsm/controls/OrbitControls.js#L1015

Stacktrace:
OrbitControls._handleTouchMoveDolly()@https://www.freecivx.net/javascript/webgl/libs/OrbitControls.js?ts=2025-01-21T19:19:36Z:1015:37 OrbitControls._handleTouchMoveDollyPan()@https://www.freecivx.net/javascript/webgl/libs/OrbitControls.js?ts=2025-01-21T19:19:36Z:1037:31 OrbitControls.onTouchMove()@https://www.freecivx.net/javascript/webgl/libs/OrbitControls.js?ts=2025-01-21T19:19:36Z:1496:9 OrbitControls.onPointerMove()@https://www.freecivx.net/javascript/webgl/libs/OrbitControls.js?ts=2025-01-21T19:19:36Z:1188:8 Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36

Reproduction steps

NA

Code

NA

Live example

www.freecivx.net

Screenshots

No response

Version

r173

Device

No response

Browser

Chrome

OS

Linux

[Mugen87]

What are the steps to reproduce the issue with misc_controls_orbit?