diff --git a/lib/Db/RelationalEntity.php b/lib/Db/RelationalEntity.php
index 5da532daa..7d1ded2ee 100644
--- a/lib/Db/RelationalEntity.php
+++ b/lib/Db/RelationalEntity.php
@@ -83,6 +83,10 @@ class RelationalEntity extends Entity implements \JsonSerializable {
 		return $json;
 	}
 
+	public function __toString(): string {
+		return (string)$this->getId();
+	}
+
 	/*
 	 * Resolve relational data from external methods
 	 *
diff --git a/lib/Service/BoardService.php b/lib/Service/BoardService.php
index cdc348119..6ab343eec 100644
--- a/lib/Service/BoardService.php
+++ b/lib/Service/BoardService.php
@@ -119,15 +119,7 @@ class BoardService {
 		$userBoards = $this->boardMapper->findAllByUser($userInfo['user'], null, null, $since, $includeArchived);
 		$groupBoards = $this->boardMapper->findAllByGroups($userInfo['user'], $userInfo['groups'],null, null, $since, $includeArchived);
 		$circleBoards = $this->boardMapper->findAllByCircles($userInfo['user'], null, null,  $since, $includeArchived);
-		$mergedBoards = array_merge($userBoards, $groupBoards, $circleBoards);
-		$result = [];
-		/** @var Board $item */
-		foreach ($mergedBoards as &$item) {
-			if (!array_key_exists($item->getId(), $result)) {
-				$result[$item->getId()] = $item;
-			}
-		}
-		return array_values($result);
+		return array_unique(array_merge($userBoards, $groupBoards, $circleBoards));
 	}
 	/**
 	 * @return array
diff --git a/lib/Service/OverviewService.php b/lib/Service/OverviewService.php
index 8099108e6..c18cbcaf8 100644
--- a/lib/Service/OverviewService.php
+++ b/lib/Service/OverviewService.php
@@ -140,7 +140,7 @@ class OverviewService {
 		$userBoards = $this->boardMapper->findAllByUser($userInfo['user'], null, null);
 		$groupBoards = $this->boardMapper->findAllByGroups($userInfo['user'], $userInfo['groups'],null, null);
 		$circleBoards = $this->boardMapper->findAllByCircles($userInfo['user'], null, null);
-		return array_merge($userBoards, $groupBoards, $circleBoards);
+		return array_unique(array_merge($userBoards, $groupBoards, $circleBoards));
 	}
 
 	private function getBoardPrerequisites($userId): array {