diff --git a/lam/lib/modules/nisNetGroupUser.inc b/lam/lib/modules/nisNetGroupUser.inc
index c491e3146..8cacc7645 100644
--- a/lam/lib/modules/nisNetGroupUser.inc
+++ b/lam/lib/modules/nisNetGroupUser.inc
@@ -355,10 +355,10 @@ class nisNetGroupUser extends baseModule {
 				continue;
 			}
 			$triples = empty($current['nisnetgrouptriple']) ? array() : $current['nisnetgrouptriple'];
-			if (!empty($changeSet['del'])) {
+			if (isset($changeSet['del'])) {
 				$triples = array_delete($changeSet['del'], $triples);
 			}
-			if (!empty($changeSet['add'])) {
+			if (isset($changeSet['add'])) {
 				$triples = array_merge($changeSet['add'], $triples);
 			}
 			$triples = array_values(array_unique($triples));
diff --git a/lam/lib/webauthn.inc b/lam/lib/webauthn.inc
index b42aede9e..07f918a9e 100644
--- a/lam/lib/webauthn.inc
+++ b/lam/lib/webauthn.inc
@@ -709,7 +709,7 @@ abstract class PublicKeyCredentialSourceRepositoryBase implements PublicKeyCrede
 		$pdo = $this->getPDO();
 		$statement = $pdo->prepare('delete from ' . $this->getTableName());
 		$statement->execute();
-		if (empty($data)) {
+		if ($data === null) {
 			return;
 		}
 		foreach ($data as $dbRow) {