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I have a search results page set up like this:

{% set searchResults = craft.entries(queryParams) %}
{% paginate searchResults as pageInfo, pageEntries %}

{% if pageEntries|length %}
  {% for yacht in pageEntries %}
    {% set prevEntry = item.prev %}
    {% set nextEntry = item.next %}
    <a href="{{ item.url }}
    {% if nextEntry or prevEntry %}?{%endif%}
    {% if nextEntry %}next={{nextEntry}}{%endif%}
    {% if prevEntry and nextEntry %}&{% endif %}
    {% if prevEntry %}prev={{prevEntry}}{%endif%}"
    >Link</a>
  {% endfor %}
{% endif %}

That works fine except that it outputs the entry title of the next and previous entries. If I do nextEntry.url or prevEntry.url (or slug) I get:

Impossible to access an attribute ("url") on a null variable.

Why is that?

1

You should check if there is a next and previous element. Most likely you reach the end or the beginning of your list and there is no element thus these variables are null so you receive an exception when you try to grab attributes from null

| improve this answer | |
  • Except that entry titles are being returned, just not url or slug. – Tyssen Jul 9 '18 at 6:13
  • What do you do to display them? Only {{ nextEntry }}? – Robin Schambach Jul 9 '18 at 6:14
  • If I do {{ nextEntry }} I get output like Entry Title. If I do {{ nextEntry.url }} or {{ nextEntry.slug }} I want to get entry-title but instead get the error. – Tyssen Jul 9 '18 at 6:23
  • Because {{ nextEntry }} will trigger the objects __toString function. You don't actually access the real title attribute as with {{ nextEntry.title }}. Without that function you would receive an object can not converted to string Exception. You need to check if the variable is null or not. Short syntax would be {{ nextEntry.url ?? '' }} – Robin Schambach Jul 9 '18 at 6:25
  • Sorry, you've lost me. If I do {% set prevEntry = item.prev.slug %} and check if prevEntry exists, I get the same type of error. If item.prev produces something, then surely the slug wouldn't be null because it's returning information about a valid entry that exists with a slug. – Tyssen Jul 9 '18 at 6:33

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