diff --git a/src/Model/Post/Engagement.php b/src/Model/Post/Engagement.php
index f88ce3bbc8..a2873d80a8 100644
--- a/src/Model/Post/Engagement.php
+++ b/src/Model/Post/Engagement.php
@@ -87,9 +87,10 @@ class Engagement
 
 		$searchtext = self::getSearchTextForItem($parent);
 		if (!$store) {
-			$content  = trim(($parent['title'] ?? '') . ' ' . ($parent['content-warning'] ?? '') . ' ' . ($parent['body'] ?? ''));
-			$language = array_key_first(Item::getLanguageArray($content, 1, 0, $parent['author-id']));
-			$store    = DI::userDefinedChannel()->match($searchtext, $language);
+			$content   = trim(($parent['title'] ?? '') . ' ' . ($parent['content-warning'] ?? '') . ' ' . ($parent['body'] ?? ''));
+			$languages = Item::getLanguageArray($content, 1, 0, $parent['author-id']);
+			$language  = !empty($languages) ? array_key_first($languages) : '';
+			$store     = DI::userDefinedChannel()->match($searchtext, $language);
 		}
 
 		$engagement = [
diff --git a/src/Module/Moderation/Reports.php b/src/Module/Moderation/Reports.php
index 4792efe628..1527c9ecf7 100644
--- a/src/Module/Moderation/Reports.php
+++ b/src/Module/Moderation/Reports.php
@@ -76,7 +76,7 @@ class Reports extends BaseModeration
 		while ($post = $this->database->fetch($posts)) {
 			if (in_array($post['rid'], array_keys($reports))) {
 				$post['created'] = DateTimeFormat::local($post['created'], DateTimeFormat::MYSQL);
-				$post['body']    = BBCode::toPlaintext($post['body']);
+				$post['body']    = BBCode::toPlaintext($post['body'] ?? '');
 
 				$reports[$post['rid']]['posts'][] = $post;
 			}
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 78a7f37b8c..c8e8faed94 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -1749,7 +1749,8 @@ class Processor
 		}
 
 		$searchtext = Engagement::getSearchTextForActivity($content, $authorid, $messageTags, $receivers);
-		$language   = array_key_first(Item::getLanguageArray($content, 1, 0, $authorid));
+		$languages  = Item::getLanguageArray($content, 1, 0, $authorid);
+		$language   = !empty($languages) ? array_key_first($languages) : '';
 		return DI::userDefinedChannel()->match($searchtext, $language);
 	}