diff --git a/frontend/src/app/worker/thumbnails.cljs b/frontend/src/app/worker/thumbnails.cljs
index 4bb06f6c1..0ab917984 100644
--- a/frontend/src/app/worker/thumbnails.cljs
+++ b/frontend/src/app/worker/thumbnails.cljs
@@ -107,7 +107,7 @@
     (->> (http/send! request)
          (rx/map http/conditional-decode-transit)
          (rx/mapcat handle-response)
-         (rx/catch body-too-large? (constantly nil))
+         (rx/catch body-too-large? (constantly (rx/of nil)))
          (rx/map (constantly params)))))
 
 (defmethod impl/handler :thumbnails/generate