Show an attribute from other model in blade (Laravel) - laravel

Question

I´ve got this exception in my blade template. I made a relation between my two models (RegisteredCourses y User) and I can see it works in the rest of Blade´s template, except form.blade.php
Trying to get property 'user' of non-object (View: C:\laragon\www\hr-english\resources\views\registeredCourse\form.blade.php) (View: C:\laragon\www\hr-english\resources\views\registeredCourse\form.blade.php)
My idea is to show in my blade template the name of the user, but I need in the value of input the correspondant user_id.
I don´t what is the correct approach to this problem.
<div class="form-group {{ $errors->has('course_id') ? 'has-error' : '' }}">
<label for="course_id" class="col-md-2 control-label">Course</label>
<div class="col-md-10">
<select class="form-control" id="course_id" name="course_id">
<option value="" style="display: none;" {{ old('course_id', optional($registeredCourse)->course_id ?: '') == '' ? 'selected' : '' }} disabled selected>Select course</option>
#foreach ($courses as $key => $course)
<option value="{{ $key }}" {{ old('course_id', optional($registeredCourse)->course_id) == $key ? 'selected' : '' }}>
{{ $course }}
</option>
#endforeach
</select>
{!! $errors->first('course_id', '<p class="help-block">:message</p>') !!}
</div>
</div>
<div class="form-group {{ $errors->has('user_id') ? 'has-error' : '' }}">
<label for="status_course" class="col-md-2 control-label">Name</label>
<div class="col-md-10">
<input class="form-control" name="user_id" type="text" id="user_id" value="{{ old('user_id', optional($registeredCourse->user->name)) }}" minlength="1" placeholder="Enter name here..."> <!--Problwm here-->
{!! $errors->first('name', '<p class="help-block">:message</p>') !!}
</div>
</div>
<div class="form-group {{ $errors->has('status_course') ? 'has-error' : '' }}">
<label for="status_course" class="col-md-2 control-label">Status Course</label>
<div class="col-md-10">
<input class="form-control" name="status_course" type="text" id="status_course" value="{{ old('status_course', optional($registeredCourse)->status_course) }}" minlength="1" placeholder="Enter status course here...">
{!! $errors->first('status_course', '<p class="help-block">:message</p>') !!}
</div>
</div>

Answer 1

Use the null coalescing operator: $registeredCourse->user->name ?? null instead of optional($registeredCourse->user->name) in your blade
UPS: Here's a demo showing how this works depending on whether $registeredCourse->user is set or not.