diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index c38cba28f1..475ccfc0b2 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -48,7 +48,7 @@ class Processor
 	 *
 	 * @return string with replaced emojis
 	 */
-	public static function replaceEmojis($body, array $emojis)
+	private static function replaceEmojis($body, array $emojis)
 	{
 		foreach ($emojis as $emoji) {
 			$replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
@@ -263,7 +263,11 @@ class Processor
 			$item['body'] = $activity['source'];
 		} else {
 			$content = HTML::toBBCode($activity['content']);
-			$content = self::replaceEmojis($content, $activity['emojis']);
+
+			if (!empty($activity['emojis'])) {
+				$content = self::replaceEmojis($content, $activity['emojis']);
+			}
+
 			$content = self::convertMentions($content);
 
 			if (($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
diff --git a/view/theme/frio/php/default.php b/view/theme/frio/php/default.php
index 29d7ab53c1..5eeb14c75f 100644
--- a/view/theme/frio/php/default.php
+++ b/view/theme/frio/php/default.php
@@ -53,7 +53,7 @@ $is_singleuser_class = $is_singleuser ? "is-singleuser" : "is-not-singleuser";
 			$nav_bg = PConfig::get($uid, 'frio', 'nav_bg');
 		}
 
-		if (empty($nav_bg)) {
+		if (empty($nav_bg) || !is_string($nav_bg)) {
 			$nav_bg = "#708fa0";
 		}