diff --git a/src/metabase/util.clj b/src/metabase/util.clj
index 081b13000d645dba7e05e9a12a52333ab5de6601..97f9ecc50ac1aad0abba2a5498c402adc2ba26d2 100644
--- a/src/metabase/util.clj
+++ b/src/metabase/util.clj
@@ -365,8 +365,9 @@
              (when-let [^java.net.URL url (try (java.net.URL. string)
                                                (catch java.net.MalformedURLException _
                                                  nil))]
-               (and (re-matches #"^https?$" (.getProtocol url))          ; these are both automatically downcased
-                    (re-matches #"^.+\..{2,}$" (.getAuthority url))))))) ; this is the part like 'google.com'. Make sure it contains at least one period and 2+ letter TLD
+               (when (and (.getProtocol url) (.getAuthority url))
+                 (and (re-matches #"^https?$" (.getProtocol url))           ; these are both automatically downcased
+                      (re-matches #"^.+\..{2,}$" (.getAuthority url)))))))) ; this is the part like 'google.com'. Make sure it contains at least one period and 2+ letter TLD
 
 (def ^:private ^:const host-up-timeout
   "Timeout (in ms) for checking if a host is available with `host-up?` and `host-port-up?`."
diff --git a/test/metabase/util_test.clj b/test/metabase/util_test.clj
index 44821c9e11ac8b5968507f0e4bbe1357fde68376..f3b3b1d2d26fbe1d7863aa3815cf79c23433de52 100644
--- a/test/metabase/util_test.clj
+++ b/test/metabase/util_test.clj
@@ -113,7 +113,7 @@
 (expect false (is-url? "http://metabasecom"))              ; no period / TLD
 (expect false (is-url? "http://.com"))                     ; no domain
 (expect false (is-url? "http://google."))                  ; no TLD
-
+(expect false (is-url? "http:/"))                          ; nil .getAuthority needs to be handled or NullPointerException
 
 ;;; ## tests for RPARTIAL