diff --git a/lib/Db/CommentMapper.php b/lib/Db/CommentMapper.php
index a934aa51f..f22887435 100644
--- a/lib/Db/CommentMapper.php
+++ b/lib/Db/CommentMapper.php
@@ -53,12 +53,17 @@ public function findByPoll(int $pollId, bool $getDeleted = false): array {
 	/**
 	 * @return void
 	 */
-	public function renameUserId(string $userId, string $replacementName): void {
+	public function renameUserId(string $userId, string $replacementId, int|null $pollId = null): void {
 		$query = $this->db->getQueryBuilder();
 		$query->update($this->getTableName(), self::TABLE)
-			->set('user_id', $query->createNamedParameter($replacementName))
-			->where($query->expr()->eq('user_id', $query->createNamedParameter($userId)))
-			->executeStatement();
+			->set('user_id', $query->createNamedParameter($replacementId))
+			->where($query->expr()->eq('user_id', $query->createNamedParameter($userId)));
+
+		if ($pollId !== null) {
+			$query->andWhere($query->expr()->eq('poll_id', $query->createNamedParameter($pollId, IQueryBuilder::PARAM_INT)));
+		}
+	
+		$query->executeStatement();
 	}
 
 	public function purgeDeletedComments(int $offset): void {
diff --git a/lib/Db/OptionMapper.php b/lib/Db/OptionMapper.php
index 80ee3b4cf..a4e72573c 100644
--- a/lib/Db/OptionMapper.php
+++ b/lib/Db/OptionMapper.php
@@ -128,12 +128,17 @@ public function findOptionsWithDuration(): array {
 		return $this->findEntities($qb);
 	}
 
-	public function renameUserId(string $userId, string $replacementName): void {
+	public function renameUserId(string $userId, string $replacementName, int|null $pollId = null): void {
 		$query = $this->db->getQueryBuilder();
 		$query->update($this->getTableName())
 			->set('owner', $query->createNamedParameter($replacementName))
-			->where($query->expr()->eq('owner', $query->createNamedParameter($userId)))
-			->executeStatement();
+			->where($query->expr()->eq('owner', $query->createNamedParameter($userId)));
+
+		if ($pollId !== null) {
+			$query->andWhere($query->expr()->eq('poll_id', $query->createNamedParameter($pollId, IQueryBuilder::PARAM_INT)));
+		}
+
+		$query->executeStatement();
 	}
 
 	public function purgeDeletedOptions(int $offset): void {
diff --git a/lib/Db/VoteMapper.php b/lib/Db/VoteMapper.php
index c4b0fcb26..5b231a898 100644
--- a/lib/Db/VoteMapper.php
+++ b/lib/Db/VoteMapper.php
@@ -115,12 +115,17 @@ public function deleteByPollAndUserId(int $pollId, string $userId): void {
 		$qb->executeStatement();
 	}
 
-	public function renameUserId(string $userId, string $replacementName): void {
+	public function renameUserId(string $userId, string $replacementId, int|null $pollId = null): void {
 		$query = $this->db->getQueryBuilder();
 		$query->update($this->getTableName())
-			->set('user_id', $query->createNamedParameter($replacementName))
-			->where($query->expr()->eq('user_id', $query->createNamedParameter($userId)))
-			->executeStatement();
+			->set('user_id', $query->createNamedParameter($replacementId))
+			->where($query->expr()->eq('user_id', $query->createNamedParameter($userId)));
+
+		if ($pollId !== null) {
+			$query->andWhere($query->expr()->eq('poll_id', $query->createNamedParameter($pollId, IQueryBuilder::PARAM_INT)));
+		}
+	
+		$query->executeStatement();
 	}
 
 	public function fixVoteOptionText(int $pollId, int $optionId, string $searchOptionText, string $replaceOptionText): void {
diff --git a/lib/Service/ShareService.php b/lib/Service/ShareService.php
index 16c4b4784..cab9b0de9 100644
--- a/lib/Service/ShareService.php
+++ b/lib/Service/ShareService.php
@@ -8,11 +8,14 @@
 
 namespace OCA\Polls\Service;
 
+use OCA\Polls\Db\CommentMapper;
+use OCA\Polls\Db\OptionMapper;
 use OCA\Polls\Db\Poll;
 use OCA\Polls\Db\PollMapper;
 use OCA\Polls\Db\Share;
 use OCA\Polls\Db\ShareMapper;
 use OCA\Polls\Db\UserMapper;
+use OCA\Polls\Db\VoteMapper;
 use OCA\Polls\Event\ShareChangedDisplayNameEvent;
 use OCA\Polls\Event\ShareChangedEmailEvent;
 use OCA\Polls\Event\ShareChangedLabelEvent;
@@ -36,7 +39,6 @@
 use OCP\DB\Exception;
 use OCP\EventDispatcher\IEventDispatcher;
 use OCP\Security\ISecureRandom;
-use phpDocumentor\Reflection\Types\This;
 use Psr\Log\LoggerInterface;
 
 class ShareService {
@@ -64,6 +66,9 @@ public function __construct(
 		private PollMapper $pollMapper,
 		private UserMapper $userMapper,
 		private UserSession $userSession,
+		private VoteMapper $voteMapper,
+		private OptionMapper $optionMapper,
+		private CommentMapper $commentMapper,
 	) {
 		$this->shares = [];
 	}
@@ -304,6 +309,7 @@ private function convertPersonalPublicShareToExternalShare(
 			return;
 		}
 
+		$initialUserId = $this->share->getUserId();
 		$this->share->setUserId($userId ?? $this->generatePublicUserId());
 		$this->share->setDisplayName($displayName ?? $this->share->getDisplayName());
 		$this->share->setTimeZoneName($timeZone ?? $this->share->getTimeZoneName());
@@ -322,6 +328,24 @@ private function convertPersonalPublicShareToExternalShare(
 		// remove personal information from user id
 		$this->share->setUserId($this->generatePublicUserId());
 		$this->share = $this->shareMapper->update($this->share);
+		$this->convertDependingObjects($initialUserId, $this->share->getUserId(), $this->share->getPollId());
+	}
+
+	/**
+	 * Rename userId as a follow up on renaming share's userId
+	 * This methods covers the situation, where a userId of a share
+	 * is changed, but there are already existing votes or options
+	 * belonging to the renamed user
+	 *
+	 * This situation could occur, if a user already registered before the update to 7.2.4 and
+	 * already voted, commented or suggested an option and reenters the poll with an email or contact share
+	 *
+	 * added in Polls 7.2.4 (can be removed later)
+	 */
+	private function convertDependingObjects(string $userId, string $replacementId, int $pollId) {
+		$this->voteMapper->renameUserId($userId, $replacementId, $pollId);
+		$this->optionMapper->renameUserId($userId, $replacementId, $pollId);
+		$this->commentMapper->renameUserId($userId, $replacementId, $pollId);
 	}
 
 	/**