PHP 7.4 Notice

Hey, I don’t not if this really a problem, but I get the following Notice:

[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 250
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 259
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 266
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 273
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 280
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 287
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 294
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 301
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 308
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 315
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 322
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 329
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 336
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 340
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 353
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 353
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 353
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 353
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 353
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 361
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 369
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 376
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 383
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 390
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 397
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 404
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 411
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 418
[20-Dec-2019 18:17:42 UTC] PHP Notice: Trying to access array offset on value of type bool in /wp-content/plugins/wp-statistics/includes/classes/class-wp-statistics-widget.php on line 425