diff --git a/packages/core/signal.mjs b/packages/core/signal.mjs
index ca20a8a2..aef1af92 100644
--- a/packages/core/signal.mjs
+++ b/packages/core/signal.mjs
@@ -649,7 +649,7 @@ export const always = register('always', function (func, pat) {
  * @memberof Pattern
  * @returns Pattern
  * @example
- *  * s("bd(5,8)").onKey("Control:j", x => x.segment(16).color("red")).onKey("Control:i", x => x.fast(2).color("blue"))
+ * s("bd(5,8)").onKey("Control:j", x => x.segment(16).color("red")).onKey("Control:i", x => x.fast(2).color("blue"))
  */
 
 export const onKey = register('onKey', function (input, func, pat) {
diff --git a/packages/core/util.mjs b/packages/core/util.mjs
index 7d3e55e9..53a017c5 100644
--- a/packages/core/util.mjs
+++ b/packages/core/util.mjs
@@ -438,6 +438,9 @@ let keyState;
 
 export function getCurrentKeyboardState() {
   if (keyState == null) {
+    if (typeof window === 'undefined') {
+      return;
+    }
     keyState = {};
     // Listen for the keydown event to mark the key as pressed
     window.addEventListener('keydown', (event) => {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 12113c61..6cb259a9 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -331,6 +331,19 @@ importers:
         specifier: ^2.1.3
         version: 2.1.3(@types/node@22.7.6)(@vitest/ui@2.1.3)(terser@5.36.0)
 
+  packages/mqtt:
+    dependencies:
+      '@strudel/core':
+        specifier: workspace:*
+        version: link:../core
+      paho-mqtt:
+        specifier: ^1.1.0
+        version: 1.1.0
+    devDependencies:
+      vite:
+        specifier: ^5.0.10
+        version: 5.4.9(@types/node@22.7.6)(terser@5.36.0)
+
   packages/osc:
     dependencies:
       '@strudel/core':
@@ -623,6 +636,9 @@ importers:
       '@strudel/mini':
         specifier: workspace:*
         version: link:../packages/mini
+      '@strudel/mqtt':
+        specifier: workspace:*
+        version: link:../packages/mqtt
       '@strudel/osc':
         specifier: workspace:*
         version: link:../packages/osc
@@ -5991,6 +6007,9 @@ packages:
     engines: {node: ^16.14.0 || >=18.0.0}
     hasBin: true
 
+  paho-mqtt@1.1.0:
+    resolution: {integrity: sha512-KPbL9KAB0ASvhSDbOrZBaccXS+/s7/LIofbPyERww8hM5Ko71GUJQ6Nmg0BWqj8phAIT8zdf/Sd/RftHU9i2HA==}
+
   parent-module@1.0.1:
     resolution: {integrity: sha512-GQ2EWRpQV8/o+Aw8YqtfZZPfNRWZYkbidE9k5rpl/hC3vtHHBfGm2Ifi6qWV+coDGkrUKZAxE3Lot5kcsRlh+g==}
     engines: {node: '>=6'}
@@ -7740,6 +7759,7 @@ packages:
 
   workbox-google-analytics@7.0.0:
     resolution: {integrity: sha512-MEYM1JTn/qiC3DbpvP2BVhyIH+dV/5BjHk756u9VbwuAhu0QHyKscTnisQuz21lfRpOwiS9z4XdqeVAKol0bzg==}
+    deprecated: It is not compatible with newer versions of GA starting with v4, as long as you are using GAv3 it should be ok, but the package is not longer being maintained
 
   workbox-navigation-preload@7.0.0:
     resolution: {integrity: sha512-juWCSrxo/fiMz3RsvDspeSLGmbgC0U9tKqcUPZBCf35s64wlaLXyn2KdHHXVQrb2cqF7I0Hc9siQalainmnXJA==}
@@ -14686,6 +14706,8 @@ snapshots:
       - bluebird
       - supports-color
 
+  paho-mqtt@1.1.0: {}
+
   parent-module@1.0.1:
     dependencies:
       callsites: 3.1.0
@@ -16979,4 +17001,4 @@ snapshots:
 
   zod@3.23.8: {}
 
-  zwitch@2.0.4: {}
\ No newline at end of file
+  zwitch@2.0.4: {}
diff --git a/test/__snapshots__/examples.test.mjs.snap b/test/__snapshots__/examples.test.mjs.snap
index 7c21d464..33529ac8 100644
--- a/test/__snapshots__/examples.test.mjs.snap
+++ b/test/__snapshots__/examples.test.mjs.snap
@@ -4902,6 +4902,8 @@ exports[`runs examples > example "often" example index 0 1`] = `
 ]
 `;
 
+exports[`runs examples > example "onKey" example index 0 1`] = `[]`;
+
 exports[`runs examples > example "orbit" example index 0 1`] = `
 [
   "[ 0/1 → 1/6 | s:hh delay:0.5 delaytime:0.25 orbit:1 ]",