Fatal error in local server

I can’t activate the free version of the MaxButtons plugin on the local server (Open Server). Fatal error.

Fatal error: Uncaught TypeError: explode() expects parameter 2 to be string, bool given in W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\max-utils.php:83 Stack trace: #0 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\max-utils.php(83): explode() #1 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\blocks\basic.php(29): MaxButtons\maxUtils::getAllowedProcotols() #2 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\button.php(69): MaxButtons\basicBlock->__construct() #3 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\button.php(51): MaxButtons\maxButton->loadBlockClasses() #4 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\maxbuttons-class.php(228): MaxButtons\maxButton->__construct() #5 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\installation.php(496): MaxButtons\maxButtonsPlugin->getClass() #6 W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\installation.php(57): MaxButtons\maxI in W:\domains\levitanstudio.loc\wp-content\plugins\maxbuttons\classes\max-utils.php on line 83