Error: Call to a member function get() on null in Drupal\paragraph_blocks\ParagraphBlocksLabeller->getParagraphFromLibrary() (line 219 of /app/web/modules/contrib/paragraph_blocks/src/ParagraphBlocksLabeller.php)
>>> [!note] Migrated issue
<!-- Drupal.org comment -->
<!-- Migrated from issue #3500266. -->
Reported by: [ekes](https://www.drupal.org/user/10083)
Related to !24
>>>
<h3 id="summary-problem-motivation">Problem/Motivation</h3>
<p>On a couple of sites using the module we started getting this error when going to add block.</p>
<pre>Error: Call to a member function get() on null in Drupal\paragraph_blocks\ParagraphBlocksLabeller->getParagraphFromLibrary() (line 219 of /app/web/modules/contrib/paragraph_blocks/src/ParagraphBlocksLabeller.php).</pre><p><a href="https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L113">https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L113</a> has loaded a paragraph, it is <a href="https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L151">https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L151</a> from_library but <a href="https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L218">https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L218</a> loads null, the target_id does not exist anymore it's been deleted.</p>
<h4 id="summary-steps-reproduce">Steps to reproduce</h4>
<p>How you get the paragraphs into this state I've not investigated.</p>
<h3 id="summary-proposed-resolution">Proposed resolution</h3>
<p>The getParagraphFromLibrary method already is allowed to return NULL <a href="https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L214">https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L214</a> although this isn't handled yet and also would cause a fatal error <a href="https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L119">https://git.drupalcode.org/project/paragraph_blocks/-/blob/069a18476bf00cfd8f6f7d53ab66923c959dcf63/src/ParagraphBlocksLabeller.php#L119</a> </p>
<p>So fixing that, by keeping the $paragraph if getting it from the library returns NULL</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br>$paragraph </span><span style="color: #007700">= </span><span style="color: #0000BB">$this</span><span style="color: #007700">-></span><span style="color: #0000BB">getParagraphFromLibrary</span><span style="color: #007700">(</span><span style="color: #0000BB">$paragraph</span><span style="color: #007700">) ?? </span><span style="color: #0000BB">$paragraph</span><span style="color: #007700">;<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>and making the method check that there is a library item</p>
<div class="codeblock">
<pre><span style="color: #000000"><span style="color: #0000BB"><?php<br></span><span style="color: #007700">if (</span><span style="color: #0000BB">$paragraph</span><span style="color: #007700">-></span><span style="color: #0000BB">hasField</span><span style="color: #007700">(</span><span style="color: #DD0000">'field_reusable_paragraph'</span><span style="color: #007700">) && </span><span style="color: #0000BB">$library_item </span><span style="color: #007700">= </span><span style="color: #0000BB">LibraryItem</span><span style="color: #007700">::</span><span style="color: #0000BB">load</span><span style="color: #007700">(</span><span style="color: #0000BB">$paragraph</span><span style="color: #007700">-></span><span style="color: #0000BB">get</span><span style="color: #007700">(</span><span style="color: #DD0000">'field_reusable_paragraph'</span><span style="color: #007700">)-></span><span style="color: #0000BB">target_id</span><span style="color: #007700">)) {<br></span><span style="color: #0000BB">?></span></span></pre></div>
<p>seems a safe thing to do, from my presently limited understanding of the code.</p>
<h3 id="summary-remaining-tasks">Remaining tasks</h3>
<p>Create a branch</p>
<pre> diff --git a/src/ParagraphBlocksLabeller.php b/src/ParagraphBlocksLabeller.php<br>index 9c77715..f2e40d4 100644<br>--- a/src/ParagraphBlocksLabeller.php<br>+++ b/src/ParagraphBlocksLabeller.php<br>@@ -113,7 +113,7 @@ class ParagraphBlocksLabeller {<br> $paragraph = $this->getParagraph($plugin_id);<br> // Replace the paragraph if it is from the paragraphs library.<br> if ($this->isParagraphFromLibrary($paragraph)) {<br>- $paragraph = $this->getParagraphFromLibrary($paragraph);<br>+ $paragraph = $this->getParagraphFromLibrary($paragraph) ?? $paragraph;<br> $definitions[$plugin_id]['category'] .= ' ' . $this->t('from library');<br> }<br> $definitions[$plugin_id]['admin_label'] = $this->getTitle($paragraph);<br>@@ -214,8 +214,7 @@ class ParagraphBlocksLabeller {<br> * The referenced paragraph entity or NULL.<br> */<br> public function getParagraphFromLibrary(Paragraph $paragraph): ?EntityInterface {<br>- if ($paragraph->hasField('field_reusable_paragraph')) {<br>- $library_item = LibraryItem::load($paragraph->get('field_reusable_paragraph')->target_id);<br>+ if ($paragraph->hasField('field_reusable_paragraph') && $library_item = LibraryItem::load($paragraph->get('field_reusable_paragraph')->target_id)) {<br> return $this->paragraphStorage->loadRevision($library_item->get('paragraphs')->target_revision_id);<br> }<br> return NULL;</pre>
issue
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