check existence of js/window to avoid undefined access

oliyh · Oct 27, 2019 · 7c3f80c · 7c3f80c
1 parent 2d058f1
commit 7c3f80c
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/re_graph/internals.cljc b/src/re_graph/internals.cljc
@@ -244,7 +244,7 @@
 
 (defn default-ws-url []
   #?(:cljs
-     (when (exists? (.-location js/window))
+     (when (and (exists? js/window) (exists? (.-location js/window)))
        (let [host-and-port (.-host js/window.location)
              ssl? (re-find #"^https" (.-origin js/window.location))]
          (str (if ssl? "wss" "ws") "://" host-and-port "/graphql-ws")))