Uncaught TypeError: count()

The 4.1.0 update is throwing the following fatal error on multiple sites. Can you add better data type handling?

PHP Fatal error:  Uncaught TypeError: count(): Argument #1 ($value) must be of type Countable|array, null given in /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/DatasetModel.php:232
Stack trace:
#0 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/ProjectModel.php(623): MPG_DatasetModel::create_index(3)
#1 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/helpers/Helper.php(505): MPG_ProjectModel::mpg_update_project_by_id(3, Array, true)
#2 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(63): MPG_Helper::mpg_live_project_data_update(Object(stdClass))
#3 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#4 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#5 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#6 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#7 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#8 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#9 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#10 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#11 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#12 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#13 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#14 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#15 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#16 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#17 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#18 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#19 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#20 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#21 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#22 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#23 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#24 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#25 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#26 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#27 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/LogsController.php(33): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#28 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/CoreModel.php(73): MPG_LogsController::mpg_write('', 'warning', 'Project has no ...')
#29 /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/controllers/CoreController.php(223): MPG_CoreModel::mpg_get_redirect_rules('/actuator/env/')
#30 /wordpress/core/6.8.2/wp-includes/class-wp-hook.php(324): MPG_CoreController::mpg_view_multipages_standard('')
#31 /wordpress/core/6.8.2/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)
#32 /wordpress/core/6.8.2/wp-includes/plugin.php(517): WP_Hook->do_action(Array)
#33 /wordpress/core/6.8.2/wp-includes/template-loader.php(13): do_action('template_redire...')
#34 /wordpress/core/6.8.2/wp-blog-header.php(19): require_once('/wordpress/core...')
#35 /wordpress/core/6.8.2/index.php(17): require('/wordpress/core...')
#36 {main}
  thrown in /srv/htdocs/wp-content/plugins/multiple-pages-generator-by-porthas/models/DatasetModel.php on line 232