このエラーメッセージに関する原因と対処に関して説明します。
エラーメッセージ(英語)：
stop countdown timer
対処
関連リンク
Stop Countdown Timer Javascript onClick - Stack Overflowstackoverflow.com/.../stop-countdown-timer-javascript...
https://stackoverflow.com/questions/16869328/stop-countdown-timer-javascript-onclick/16869475
Stop countdown timer if user wins game - Stack Overflowstackoverflow.com/.../stop-countdown-timer-if-user-wi...
https://stackoverflow.com/questions/22159171/stop-countdown-timer-if-user-wins-game
Countdown From Any Time To Zero - jQuery.Countdown.js ...www.jqueryscript.net/time.../countdown-time-zero.html
https://www.jqueryscript.net/time-clock/countdown-time-zero.html