diff --git a/README.md b/README.md
index 5baad11..26a5920 100644
--- a/README.md
+++ b/README.md
@@ -581,7 +581,7 @@ Since mount is a _library_ it should _not_ bring any dependencies unless its fun
 
 > But I still these logging statements in the examples.
 
-The way this is done is via an excellent [robert hooke](https://github.com/technomancy/robert-hooke/). Example applications live in `test`, so does the [utility](https://github.com/tolitius/mount/blob/75d7cdc610ce38623d4d3aea1da3170d1c9a3b4b/test/app/utils/logging.clj#L44) that adds logging to all the mount's lifecycle functions on start in [dev.clj](https://github.com/tolitius/mount/blob/75d7cdc610ce38623d4d3aea1da3170d1c9a3b4b/dev/dev.clj#L21).
+The way this is done is via an excellent [robert hooke](https://github.com/technomancy/robert-hooke/). Example applications live in `test`, so does the [utility](test/clj/tapp/utils/logging.clj#L42) that adds logging to all the mount's lifecycle functions on start in [dev.clj](https://github.com/tolitius/mount/blob/75d7cdc610ce38623d4d3aea1da3170d1c9a3b4b/dev/dev.clj#L21).
 
 ## Clojure Version
 
diff --git a/src/mount/core.cljc b/src/mount/core.cljc
index 7ee4df0..4973067 100644
--- a/src/mount/core.cljc
+++ b/src/mount/core.cljc
@@ -317,7 +317,7 @@
 
   (on-change [_ ks]
     (doseq [k ks]
-      (let [states (@watchers k)]
+      (when-let [states (seq (@watchers k))]
         (apply stop states)
         (apply start states)))))