diff --git a/src/Model/ItemURI.php b/src/Model/ItemURI.php
index 7f05786c8e..6421b2dbd9 100644
--- a/src/Model/ItemURI.php
+++ b/src/Model/ItemURI.php
@@ -31,10 +31,10 @@ class ItemURI
 	 *
 	 * @param array $fields Item-uri fields
 	 *
-	 * @return integer item-uri id
+	 * @return int|null item-uri id
 	 * @throws \Exception
 	 */
-	public static function insert($fields)
+	public static function insert(array $fields)
 	{
 		// If the URI gets too long we only take the first parts and hope for best
 		$uri = substr($fields['uri'], 0, 255);
diff --git a/src/Protocol/ActivityPub/Processor.php b/src/Protocol/ActivityPub/Processor.php
index 088a10e908..f60eea7122 100644
--- a/src/Protocol/ActivityPub/Processor.php
+++ b/src/Protocol/ActivityPub/Processor.php
@@ -327,6 +327,10 @@ class Processor
 		$item['guid'] = $activity['diaspora:guid'] ?: $guid;
 
 		$item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
+		if (empty($item['uri-id'])) {
+			Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
+			return [];
+		}
 
 		$item = self::processContent($activity, $item);
 		if (empty($item)) {