diff --git a/frontend/src/app/main/ui/shapes/shape.cljs b/frontend/src/app/main/ui/shapes/shape.cljs
index 659ce9f23..0cb212a8a 100644
--- a/frontend/src/app/main/ui/shapes/shape.cljs
+++ b/frontend/src/app/main/ui/shapes/shape.cljs
@@ -42,7 +42,7 @@
 
 (defn propagate-wrapper-styles
   ([children wrapper-props]
-   (if (.isArray js/Array children)
+   (if ^boolean (obj/array? children)
      (->> children (map #(propagate-wrapper-styles-child % wrapper-props)))
      (-> children (propagate-wrapper-styles-child wrapper-props)))))
 
diff --git a/frontend/src/app/util/object.cljs b/frontend/src/app/util/object.cljs
index 4c6d31981..c9caf8f2b 100644
--- a/frontend/src/app/util/object.cljs
+++ b/frontend/src/app/util/object.cljs
@@ -6,11 +6,15 @@
 
 (ns app.util.object
   "A collection of helpers for work with javascript objects."
-  (:refer-clojure :exclude [set! new get get-in merge clone contains?])
+  (:refer-clojure :exclude [set! new get get-in merge clone contains? array?])
   (:require
    ["lodash/omit" :as omit]
    [cuerdas.core :as str]))
 
+(defn array?
+  [o]
+  (.isArray js/Array o))
+
 (defn create [] #js {})
 
 (defn get