diff --git a/lib/Migration/Version010200Date20200323141300.php b/lib/Migration/Version010200Date20200323141300.php
index aad7c07..afb5463 100644
--- a/lib/Migration/Version010200Date20200323141300.php
+++ b/lib/Migration/Version010200Date20200323141300.php
@@ -259,7 +259,7 @@ class Version010200Date20200323141300 extends SimpleMigrationStep {
 				//In case the old Question would have been longer than current possible length, create a warning and shorten text to avoid Error on upgrade.
 				if (strlen($question['form_question_text']) > 2048) {
 					$output->warning("Question-text is too long for new Database: '" . $question['form_question_text'] . "'");
-					$question['form_question_text'] = substr($question['form_question_text'], 0, 2048);
+					$question['form_question_text'] = mb_substr($question['form_question_text'], 0, 2048);
 				}
 
 				$qb_restore->insert('forms_v2_questions')
@@ -285,7 +285,7 @@ class Version010200Date20200323141300 extends SimpleMigrationStep {
 				//In case the old Answer would have been longer than current possible length, create a warning and shorten text to avoid Error on upgrade.
 				if (strlen($answer['text']) > 1024) {
 					$output->warning("Option-text is too long for new Database: '" . $answer['text'] . "'");
-					$answer['text'] = substr($answer['text'], 0, 1024);
+					$answer['text'] = mb_substr($answer['text'], 0, 1024);
 				}
 
 				$qb_restore->insert('forms_v2_options')
@@ -352,7 +352,7 @@ class Version010200Date20200323141300 extends SimpleMigrationStep {
 				//In case the old Answer would have been longer than current possible length, create a warning and shorten text to avoid Error on upgrade.
 				if (strlen($vote['vote_answer']) > 2048) {
 					$output->warning("Answer-text is too long for new Database: '" . $vote['vote_answer'] . "'");
-					$vote['vote_answer'] = substr($vote['vote_answer'], 0, 2048);
+					$vote['vote_answer'] = mb_substr($vote['vote_answer'], 0, 2048);
 				}
 
 				/* Due to the unconventional storing fo vote_option_ids, the vote_option_id needs to get mapped onto old question-id and from there to new question-id.