diff --git a/lib/Reference/GitlabReferenceProvider.php b/lib/Reference/GitlabReferenceProvider.php
index eb6e3bc..ed425e7 100644
--- a/lib/Reference/GitlabReferenceProvider.php
+++ b/lib/Reference/GitlabReferenceProvider.php
@@ -153,6 +153,8 @@ public function resolveReference(string $referenceText): ?IReference {
 					$projectLabels = $account !== null ? $this->gitlabAPIService->getProjectLabels($account, $baseUrl, $projectInfo['id']) : [];
 					$commentInfo = $this->getIssueCommentInfo($account, $baseUrl, $projectInfo['id'], $issueId, $end);
 					$issueInfo = $this->gitlabAPIService->getIssueInfo($account, $baseUrl, $projectInfo['id'], $issueId);
+					// Ensure all issue labels are in projectLabels (some may be group-level labels not returned by project labels API)
+					$projectLabels = $this->ensureLabelsExist($projectLabels, $issueInfo['labels'] ?? []);
 					$reference = new Reference($referenceText);
 					$reference->setRichObject(
 						Application::APP_ID,
@@ -183,6 +185,8 @@ public function resolveReference(string $referenceText): ?IReference {
 					$projectLabels = $account !== null ? $this->gitlabAPIService->getProjectLabels($account, $baseUrl, $projectInfo['id']) : [];
 					$commentInfo = $this->getPrCommentInfo($account, $baseUrl, $projectInfo['id'], $prId, $end);
 					$prInfo = $this->gitlabAPIService->getPrInfo($account, $baseUrl, $projectInfo['id'], $prId);
+					// Ensure all PR labels are in projectLabels (some may be group-level labels not returned by project labels API)
+					$projectLabels = $this->ensureLabelsExist($projectLabels, $prInfo['labels'] ?? []);
 					$reference = new Reference($referenceText);
 					$reference->setRichObject(
 						Application::APP_ID,
@@ -319,6 +323,34 @@ private function getGenericPrInfo(array $prInfo, array $projectLabels): array {
 		return $info;
 	}
 
+	/**
+	 * Ensure all labels from the issue/PR exist in the project labels array.
+	 * This is needed because some labels may be group-level labels that are not returned
+	 * by the project labels API, causing frontend errors when trying to find them.
+	 *
+	 * @param array $projectLabels
+	 * @param array $itemLabels
+	 * @return array
+	 */
+	private function ensureLabelsExist(array $projectLabels, array $itemLabels): array {
+		$existingLabelNames = array_map(static fn (array $label) => $label['name'], $projectLabels);
+
+		foreach ($itemLabels as $labelName) {
+			if (!in_array($labelName, $existingLabelNames, true)) {
+				// Add a minimal label entry for labels not found in project labels
+				$projectLabels[] = [
+					'id' => null,
+					'name' => $labelName,
+					'color' => '#808080',
+					'text_color' => '#FFFFFF',
+					'description' => null,
+				];
+			}
+		}
+
+		return $projectLabels;
+	}
+
 	/**
 	 * @param string $gitlabUrl
 	 * @param string $url
diff --git a/lib/Service/GitlabAPIService.php b/lib/Service/GitlabAPIService.php
index d72287f..af96d4a 100644
--- a/lib/Service/GitlabAPIService.php
+++ b/lib/Service/GitlabAPIService.php
@@ -214,7 +214,11 @@ public function getGroupsList(GitLabAccount $account): array {
 	public function getUserAvatar(GitlabAccount $account, string $baseUrl, int $gitlabUserId): array {
 		$userInfo = $this->request($account, $baseUrl, 'users/' . $gitlabUserId);
 		if (!isset($userInfo['error']) && isset($userInfo['avatar_url'])) {
-			return ['avatarContent' => $this->client->get($userInfo['avatar_url'])->getBody()];
+			try {
+				return ['avatarContent' => $this->client->get($userInfo['avatar_url'])->getBody()];
+			} catch (Exception $e) {
+				$this->logger->debug('Failed to fetch GitLab user avatar: ' . $e->getMessage(), ['app' => Application::APP_ID]);
+			}
 		}
 		return ['userInfo' => $userInfo];
 	}
@@ -222,7 +226,11 @@ public function getUserAvatar(GitlabAccount $account, string $baseUrl, int $gitl
 	public function getProjectAvatar(GitlabAccount $account, string $baseUrl, int $projectId): array {
 		$projectInfo = $this->request($account, $baseUrl, 'projects/' . $projectId);
 		if (!isset($projectInfo['error']) && isset($projectInfo['avatar_url'])) {
-			return ['avatarContent' => $this->client->get($projectInfo['avatar_url'])->getBody()];
+			try {
+				return ['avatarContent' => $this->client->get($projectInfo['avatar_url'])->getBody()];
+			} catch (Exception $e) {
+				$this->logger->debug('Failed to fetch GitLab project avatar: ' . $e->getMessage(), ['app' => Application::APP_ID]);
+			}
 		}
 		return ['projectInfo' => $projectInfo];
 	}