diff --git a/classes/Quiz.php b/classes/Quiz.php
index 89047cd57f..8bdee77039 100644
--- a/classes/Quiz.php
+++ b/classes/Quiz.php
@@ -833,7 +833,7 @@ function ( $ans ) {
 						/**
 						 * Answers from user input
 						 */
-						$given_answer = (array) array_map( 'sanitize_text_field', $answers );
+						$given_answer = is_array( $answers ) ? array_map( 'sanitize_text_field', $answers ) : array( sanitize_text_field( $answers ) );
 						$given_answer = maybe_serialize( $given_answer );
 
 						/**