diff --git a/lib/Db/UserMapper.php b/lib/Db/UserMapper.php
index 628aedd23..6a2e03ec9 100644
--- a/lib/Db/UserMapper.php
+++ b/lib/Db/UserMapper.php
@@ -127,13 +127,16 @@ public function getParticipant(string $userId, ?int $pollId = null): UserBase {
 			// just catch and continue if not found and try to find user by share;
 		}
 
-		try {
-			$share = $this->getShareByPollAndUser($userId, $pollId);
-			return $this->getUserFromShare($share);
-		} catch (ShareNotFoundException $e) {
-			// User seems to be probaly deleted, use fake share
-			return new Ghost($userId);
+		if ($pollId !== null) {
+			try {
+				$share = $this->getShareByPollAndUser($userId, $pollId);
+				return $this->getUserFromShare($share);
+			} catch (ShareNotFoundException $e) {
+				// User seems to be probably deleted, use fake share
+				return new Ghost($userId);
+			}
 		}
+		return new Ghost($userId);
 	}
 
 	/**
@@ -175,7 +178,7 @@ public function getUserFromUserBase(string $userId, ?int $pollId = null): User {
 		if ($user instanceof IUser) {
 			try {
 				// check if we find a share, where the user got admin rights for the particular poll
-				if ($this->getShareByPollAndUser($userId, $pollId)->getType() === Share::TYPE_ADMIN) {
+				if (($pollId !== null) && $this->getShareByPollAndUser($userId, $pollId)->getType() === Share::TYPE_ADMIN) {
 					return new Admin($userId);
 				}
 			} catch (Exception $e) {
@@ -215,15 +218,15 @@ public function getUserObject(string $type, string $id, string $displayName = ''
 
 	private function getShareByToken(string $token): Share {
 		$qb = $this->db->getQueryBuilder();
-	
+
 		$qb->select('*')
 			->from($this->getTableName())
 			->where($qb->expr()->eq('token', $qb->createNamedParameter($token, IQueryBuilder::PARAM_STR)));
-	
+
 		return $this->findEntity($qb);
 	}
 
-	private function getShareByPollAndUser(string $userId, ?int $pollId = null): Share {
+	private function getShareByPollAndUser(string $userId, int $pollId): Share {
 		$qb = $this->db->getQueryBuilder();
 
 		$qb->select('*')
diff --git a/lib/Model/Acl.php b/lib/Model/Acl.php
index 00148e954..d317c0f30 100644
--- a/lib/Model/Acl.php
+++ b/lib/Model/Acl.php
@@ -70,6 +70,8 @@ class Acl implements JsonSerializable {
 	public const PERMISSION_ALL_ACCESS = 'allAccess';
 	private ?int $pollId = null;
 	private ?UserBase $currentUser = null;
+	// Cache whether the current poll has shares
+	private bool $noShare = false;
 
 
 	/**
@@ -148,13 +150,26 @@ public function setPollId(?int $pollId = null, string $permission = self::PERMIS
 		} else {
 			$this->pollId = $pollId;
 		}
-		
+
 		$this->loadPoll();
 		$this->request($permission);
 
 		return $this;
 	}
 
+	/**
+	 * Set poll id and load poll
+	 * @return $this
+	 */
+	public function setPoll(Poll $poll, string $permission = self::PERMISSION_POLL_VIEW): static {
+		$this->pollId = $poll->getId();
+		$this->poll = $poll;
+		$this->noShare = false;
+		$this->request($permission);
+
+		return $this;
+	}
+
 	public function getPoll(): ?Poll {
 		if ($this->getToken()) {
 			// first verify working share
@@ -173,7 +188,7 @@ public function getShare(): ?Share {
 
 		return $this->share;
 	}
-	
+
 	/**
 	 * load poll
 	 * @throws NotFoundException Thrown if poll not found
@@ -187,6 +202,7 @@ private function loadPoll(): void {
 		try {
 			// otherwise load poll from db
 			$this->poll = $this->pollMapper->find((int) $this->pollId);
+			$this->noShare = false;
 		} catch (DoesNotExistException $e) {
 			throw new NotFoundException('Error loading poll with id ' . $this->pollId);
 		}
@@ -199,16 +215,26 @@ private function loadPoll(): void {
 	 * and the pollId will get set to the share's pollId
 	 */
 	private function loadShare(): void {
+		if ($this->noShare) {
+			throw new ShareNotFoundException('No token was set for ACL');
+		}
+
 		// no token in session, try to find a user, who matches
 		if (!$this->getToken()) {
 			if ($this->getCurrentUser()->getIsLoggedIn()) {
 				// search for logged in user's share, load it and return
-				$this->share = $this->shareMapper->findByPollAndUser($this->getPollId(), $this->getUserId());
+				try {
+					$this->share = $this->shareMapper->findByPollAndUser($this->getPollId(), $this->getUserId());
+				} catch (\Throwable $ex) {
+					$this->noShare = true;
+					throw $ex;
+				}
 				// store share in session for further validations
 				// $this->session->set(AppConstants::SESSION_KEY_SHARE_TOKEN, $this->share->getToken());
 				return;
 			} else {
 				$this->share = new Share();
+				$this->noShare = true;
 				// must fail, if no token is present and not logged in
 				throw new ShareNotFoundException('No token was set for ACL');
 			}
@@ -502,7 +528,7 @@ private function getAllowAddOptions(): bool {
 	 * @return bool|null
 	 */
 	private function getAllowDeleteOption(?string $optionOwner, ?int $pollId) {
-		
+
 		if (!$pollId) {
 			$this->logger->warning('Poll id missing');
 			return false;
@@ -519,7 +545,7 @@ private function getAllowDeleteOption(?string $optionOwner, ?int $pollId) {
 			$this->logger->warning('Option owner missing');
 			return false;
 		}
-		
+
 
 		if ($this->matchUser($optionOwner)) {
 			return true;
diff --git a/lib/Service/PollService.php b/lib/Service/PollService.php
index c8027c804..22e6d5ffa 100644
--- a/lib/Service/PollService.php
+++ b/lib/Service/PollService.php
@@ -81,7 +81,7 @@ public function list(): array {
 			$this->preferences = $this->preferencesService->get();
 			foreach ($polls as $poll) {
 				try {
-					$this->acl->setPollId($poll->getId());
+					$this->acl->setPoll($poll);
 					$relevantThreshold = $poll->getRelevantThresholdNet() + $this->preferences->getRelevantOffsetTimestamp();
 
 					// mix poll settings, currentUser attributes, permissions and relevantThreshold into one array