Error with text field replacement in paragraphs

Problem/Motivation

An error occurs when replacing a string in a text field of a paragraph.

Error: Cannot use string offset as an array in Drupal\scanner\Plugin\Scanner\Paragraph->replace() (line 147 of /app/docroot/modules/contrib/scanner/src/Plugin/Scanner/Paragraph.php)

Steps to reproduce

Occurs when a paragraph is included in the replace target.

I think the solution is to change the string variable that causes the error an array.

src/Plugin/Scanner/Paragraph.php

public function replace($field, $values, $undo_data) {
    list($entityType, $bundle, $fieldname) = explode(':', $field);
    $data = $undo_data;
+    if (!is_array($data)) {
+      $data = [];
+    }