Add check so $values is a array before using it as a array

src/properties/class-papi-property-repeater.php

@@ -711,6 +711,7 @@ protected function render_repeater_head() {
 	protected function render_repeater_rows() {
 		$items  = $this->get_settings_properties();
 		$values = $this->get_value();
+		$values = is_array( $values ) ? $values : [];
 		$slugs  = wp_list_pluck( $items, 'slug' );
 
 		// Remove values that don't exists in the slugs array.