fix mapper

app/Livewire/MapperLeft.php

@@ -75,7 +75,7 @@ class MapperLeft extends Component implements HasActions, HasSchemas, HasTable
                 TextColumn::make('competition_group.name')->label('Group')
                     ->wrap()
                     ->tooltip('Click to filter by this group')
-                    ->description(fn ($record): string => $record->country->name)
+                    ->description(fn ($record): string => $record->country?->name ?? '')
                     ->action(function ($record) {
                         if (! in_array($record->competition_group_id, $this->tableFilters['events']['competition_group_id'])) {
                             $this->tableFilters['events']['competition_group_id'][] = (string) $record->competition_group_id;