diff --git a/HTML/QuickForm.php b/HTML/QuickForm.php
index a219b15f9..ffa992548 100644
--- a/HTML/QuickForm.php
+++ b/HTML/QuickForm.php
@@ -1950,7 +1950,7 @@ function exportValues($elementList = null)
                     // …or should be skipped…
                     or CRM_Core_HTMLInputCoder::isSkippedField($fldName)
                     //CRM-17962 - do not encode if element is a wysiwyg editor
-                    or CRM_Utils_Array::value('class', $this->_elements[$key]->_attributes) == 'crm-form-wysiwyg'
+                    or in_array('crm-form-wysiwyg', explode(' ', $this->_elements[$key]->_attributes['class'] ?? []))
                 ) {
                     // …don’t filter, otherwise filter (else clause below)
                 } else {