diff --git a/src/engine/documenturldb.h b/src/engine/documenturldb.h
--- a/src/engine/documenturldb.h
+++ b/src/engine/documenturldb.h
@@ -85,7 +85,10 @@
 template <typename Functor>
 void DocumentUrlDB::replace(quint64 docId, const QByteArray& url, Functor shouldDeleteFolder)
 {
-    Q_ASSERT(docId > 0);
+    if (!docId || url.endsWith('/') || !url.startsWith('/')) {
+        qWarning() << "replace called with invalid arguments, docId:" << docId << "url:" << url;
+        return;
+    }
     IdFilenameDB idFilenameDb(m_idFilenameDbi, m_txn);
     IdTreeDB idTreeDb(m_idTreeDbi, m_txn);