diff --git a/examples/ring-malli-swagger/src/example/server.clj b/examples/ring-malli-swagger/src/example/server.clj
index 9969b618..b4f63582 100644
--- a/examples/ring-malli-swagger/src/example/server.clj
+++ b/examples/ring-malli-swagger/src/example/server.clj
@@ -70,7 +70,7 @@
        ;;:reitit.spec/wrap spell/closed ;; strict top-level validation
        :exception pretty/exception
        :data {:coercion (reitit.coercion.malli/create
-                          {:error-keys #{:type :coercion :in :humanized #_:schema #_:value #_:transformed #_:errors}})
+                          {:error-keys #{#_:type :coercion :in :humanized :schema :value #_:transformed #_:errors}})
               :muuntaja m/instance
               :middleware [;; swagger feature
                            swagger/swagger-feature
diff --git a/modules/reitit-malli/src/reitit/coercion/malli.cljc b/modules/reitit-malli/src/reitit/coercion/malli.cljc
index 05073955..89f2618f 100644
--- a/modules/reitit-malli/src/reitit/coercion/malli.cljc
+++ b/modules/reitit-malli/src/reitit/coercion/malli.cljc
@@ -26,6 +26,7 @@
 (def default-transformer
   mt/strip-extra-keys-transformer)
 
+;; TODO: are these needed?
 (defmulti coerce-response? identity :default ::default)
 (defmethod coerce-response? ::default [_] true)
 
@@ -37,7 +38,7 @@
                                              (m/explainer schema opts))))
           {:keys [formats default]} (transformers type)
           default-coercer (->coercer default)
-          format-coercers (some->> (for [[f t] formats] [f (->coercer t)]) (keep second) (seq) (into {}))
+          format-coercers (some->> (for [[f t] formats] [f (->coercer t)]) (filter second) (seq) (into {}))
           get-coercer (cond format-coercers (fn [format] (or (get format-coercers format) default-coercer))
                             default-coercer (constantly default-coercer))]
       (if get-coercer
@@ -152,7 +153,7 @@
                  (show? :schema) (update :schema edn/write-string opts)
                  (show? :errors) (-> (me/with-error-messages opts)
                                      (update :errors (partial map #(update % :schema edn/write-string opts))))
-                 true (select-keys error-keys)))
+                 (seq error-keys) (select-keys error-keys)))
        (-request-coercer [_ type schema]
          (-coercer schema type transformers :decode options))
        (-response-coercer [_ schema]
diff --git a/project.clj b/project.clj
index 89a3dbcb..835f9907 100644
--- a/project.clj
+++ b/project.clj
@@ -33,7 +33,7 @@
                          [metosin/muuntaja "0.6.5"]
                          [metosin/jsonista "0.2.5"]
                          [metosin/sieppari "0.0.0-alpha7"]
-                         [metosin/malli "0.0.1-SNAPSHOT"]
+                         [metosin/malli "0.0.1-20191228.073043-6"]
 
                          [meta-merge "1.0.0"]
                          [fipp "0.6.21" :exclusions [org.clojure/core.rrb-vector]]