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Error message
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).
Deprecated function: trim(): Passing null to parameter #1 ($string) of type string is deprecated in Drupal\collapse_text\Plugin\Filter\CollapseText->processChildItem() (line 277 of modules/contrib/collapse_text/src/Plugin/Filter/CollapseText.php).