Attempt to read property "model" on null.

I have a table that has a column "Briefcase" to show if the record (Business) belongs to a Briefcase.
I'm implementing "->tooltip" to show to which User's Briefcase the Business belongs to.

Tables\Columns\TextColumn::make('briefcase.user.name')
    ->label('Briefcase')
    ->tooltip(fn (Business $record): string => "Business in " . $record->briefcase->user->name . "'s Briefcase"),

Tables\Columns\TextColumn::make('briefcase.user.name')
    ->label('Briefcase')
    ->tooltip(fn (Business $record): string => "Business in " . $record->briefcase->user->name . "'s Briefcase"),

Tables\Columns\TextColumn::make('briefcase.user.name')
    ->label('Briefcase')
    ->tooltip(fn (Business $record): string => "Business in " . $record->briefcase->user->name . "'s Briefcase"),

Tables\Columns\TextColumn::make('briefcase.user.name')
    ->label('Briefcase')
    ->tooltip(fn (Business $record): string => "Business in " . $record->briefcase->user->name . "'s Briefcase"),

The above "tooltip" code fails when one business is not allocated to any Briefcase,
I get:

Attempt to read property "user" on null

Attempt to read property "user" on null

Attempt to read property "user" on null

Attempt to read property "user" on null

Please, any ideas how can I fix it?
Thanks.

Attempt to read property "model" on null.

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