diff --git a/sources/subs/PersonalMessage.subs.php b/sources/subs/PersonalMessage.subs.php
index b33a73e549..0402e80f26 100644
--- a/sources/subs/PersonalMessage.subs.php
+++ b/sources/subs/PersonalMessage.subs.php
@@ -81,6 +81,7 @@ function loadPMLabels($labels)
 			'not_deleted' => 0,
 		)
 	);
+	$labels = array();
 	while ($row = $db->fetch_assoc($result))
 	{
 		$this_labels = explode(',', $row['labels']);
@@ -1899,6 +1900,7 @@ function loadPMRecipientInfo($all_pms, &$recipients, $folder = '', $search = fal
 			// Read and replied to status for this message
 			$message_replied[$row['id_pm']] = $row['is_read'] & 2;
 			$message_unread[$row['id_pm']] = $row['is_read'] == 0;
+			$message_labels[$row['id_pm']] = array();
 
 			$row['labels'] = $row['labels'] == '' ? array() : explode(',', $row['labels']);
 			foreach ($row['labels'] as $v)