diff --git a/src/models/completionmodel.cpp b/src/models/completionmodel.cpp
index dca0c7732..1f0443ae5 100644
--- a/src/models/completionmodel.cpp
+++ b/src/models/completionmodel.cpp
@@ -87,8 +87,11 @@ QVariant CompletionModel::data(const QModelIndex &index, int role) const
             return m_filterModel->data(filterIndex, RoomListModel::CanonicalAliasRole);
         }
         if (role == IconNameRole) {
-            return QStringLiteral("mxc://%1")
-                .arg(m_roomListModel->connection()->makeMediaUrl(m_filterModel->data(filterIndex, RoomListModel::AvatarRole).toUrl()).toString());
+            auto mediaId = m_filterModel->data(filterIndex, RoomListModel::AvatarRole).toString();
+            if (mediaId.isEmpty()) {
+                return QVariant();
+            }
+            return m_room->connection()->makeMediaUrl(QUrl(QStringLiteral("mxc://%1").arg(mediaId)));
         }
     }
     if (m_autoCompletionType == Emoji) {