Warning: Attempt to read property "name" on array in paragraphs_bundle_title_callback() (line 1210 of paragraphs.module).

[alanmels]

The warning persists during uninstalling a custom module that uses paragraphs, because by that time the module's hook_menu_alter no longer runs, and Backdrop calls Paragraphs’ own paragraphs_bundle_title_callback(), which assumes $bundle is always an object. Would be nice if Paragraphs’ callback accepted arrays (even with multiple objects), so the code would look something like:

function paragraphs_bundle_title_callback($bundle) {
  // Accept arrays (sometimes contain one or more bundle objects during menu rebuild).
  if (is_array($bundle)) {
    foreach ($bundle as $v) {
      if (is_object($v)) {
        $bundle = $v;
        break;
      }
      // Handle nested arrays defensively.
      if (is_array($v)) {
        foreach ($v as $v2) {
          if (is_object($v2)) { $bundle = $v2; break 2; }
        }
      }
    }
  }

  $name = '';
  if (is_object($bundle)) {
    // Prefer label, then name, then bundle machine name.
    if (!empty($bundle->label)) {
      $name = $bundle->label;
    }
    elseif (!empty($bundle->name)) {
      $name = $bundle->name;
    }
    elseif (!empty($bundle->bundle)) {
      $name = $bundle->bundle;
    }
  }
  elseif (is_string($bundle)) {
    $name = $bundle;
  }

  if ($name === '') {
    $name = t('Paragraph type');
  }
  return t('@name', array('@name' => $name));
}

Until this fixed, we are temporarily using this tiny module:

para_title_fix.info

name = Paragraphs title fix
description = Makes Paragraphs bundle title callback tolerate array/object during menu rebuilds.
type = module
core = 1.x
package = Custom

para_title_fix.module

<?php
<?php

/**
 * Implements hook_menu_alter().
 * Replace Paragraphs' bundle title callback with a robust version.
 */
function para_title_fix_menu_alter(&$items) {
  foreach ($items as &$def) {
    if (!empty($def['title callback']) && $def['title callback'] === 'paragraphs_bundle_title_callback') {
      $def['title callback'] = 'para_title_fix_paragraphs_bundle_title_callback';
    }
  }
}

/**
 * Safe title callback for Paragraphs bundle pages.
 * Accepts an object or an array (even with multiple objects).
 */
function para_title_fix_paragraphs_bundle_title_callback($bundle) {
  // Normalize arrays to the first object found (also handle nested arrays).
  if (is_array($bundle)) {
    $bundle = _para_title_fix_first_object($bundle);
  }

  $name = '';
  if (is_object($bundle)) {
    $name = !empty($bundle->label) ? $bundle->label
          : (!empty($bundle->name) ? $bundle->name
          : (!empty($bundle->bundle) ? $bundle->bundle : ''));
  } elseif (is_string($bundle)) {
    $name = $bundle;
  }

  if ($name === '') {
    $name = t('Paragraph type');
  }
  return t('@name', array('@name' => $name));
}

/**
 * Find the first object within a (possibly nested) array.
 */
function _para_title_fix_first_object($value) {
  foreach ($value as $v) {
    if (is_object($v)) {
      return $v;
    }
    if (is_array($v)) {
      $o = _para_title_fix_first_object($v);
      if (is_object($o)) {
        return $o;
      }
    }
  }
  return (object) array();
}