Trying to get property of non-object on Laravel 5 - php

Question

Thank you for all the help in the past.
On my app, when i try to view a certain blade, it returns the error
"Trying to get property of non-object".
It has pointed me to the blade and the section of code where the error comes from:
#extends('layouts.app')
#section('content')
#component('dashboard.frame')
<div class="panel panel-default">
<div class="panel-heading">
Create
Activation Pins - {{ $item->name }}
</div>
{{--<div class="panel-body">--}}
{{--#if($pin_item && !$pin_item->pivot->is_paid )--}}
{{--<form action="/activation-pins/{{ $pin_item->id }}" method="post">--}}
{{--<input type="hidden" name="_method" value="PUT">--}}
{{--<input type="hidden" name="vendor_id" value="{{ $item->vendor->id }}">--}}
{{--{!! csrf_field() !!}--}}
{{--<button type="submit" class="btn btn-success">Mark As Paid</button>--}}
{{--</form>--}}
{{--#endif--}}
{{--</div>--}}
<table class="table">
<thead>
<tr>
<th>S/N</th>
<th>Name</th>
<th>Is Active</th>
<th>User</th>
</tr>
</thead>
<tbody>
#forelse($item->activation_pins as $itm)
<tr>
<td>{{ $loop->index + 1 }}</td>
<td>{{ $itm->pin }}</td>
<td>
<span class="label label-{{ $itm->is_active ? ( $itm->is_valid ? 'info' : 'danger' ) : 'warning' }}">
{{ $itm->is_active ? ( $itm->is_valid ? 'active' : 'expired' ) : 'inactive' }}
</span>
</td>
<td>
{{ $itm->user_id ? $itm->user->email : '-' }}
</td>
</tr>
#empty
<tr>
<td colspan="6">
<p class="text-center">No Activation Pins</p>
</td>
</tr>
#endforelse
</tbody>
</table>
</div>
#endcomponent
#endsection
With emphasis on:
<td>
{{ $itm->user_id ? $itm->user->email : '-' }}
</td>
Could I be missing something? Thanks.
This is what it displays now: