diff --git a/README.md b/README.md
index f93ed57..64cf808 100644
--- a/README.md
+++ b/README.md
@@ -171,7 +171,7 @@ Following events are implemented:
 This example will automatically connect to a WiFi access point with the given SSID and password on the interface "wlan0".
 
 ```bash
-curl -sSf -X POST "http://rpi-test:8080/network/sta" \
+curl -X POST "http://rpi-test:8080/network/sta" \
   -H "Content-Type: application/json" \
   -H "X-API-Token: 1234567890" \
   -d '{
@@ -187,7 +187,7 @@ curl -sSf -X POST "http://rpi-test:8080/network/sta" \
 This example will create an access point on the interface "wlan0" with the given SSID and password.
 
 ```bash
-curl -sSf -X POST "http://rpi-test:8080/network/ap" \
+curl -X POST "http://rpi-test:8080/network/ap" \
   -H "Content-Type: application/json" \
   -H "X-API-Token: 1234567890" \
   -d '{
@@ -197,3 +197,15 @@ curl -sSf -X POST "http://rpi-test:8080/network/ap" \
     "autoconnect": true
   }'
 ```
+### Restart the cluster
+
+This example will restart all nodes in the cluster
+
+```bash
+curl -X POST "http://rpi-test:8080/cluster/event" \
+  -H "accept: application/json" \
+  -H "X-API-Token: 1234567890" \
+  -d '{
+    "name": "restart"
+  }'
+```
\ No newline at end of file
diff --git a/pkg/http/handlers.go b/pkg/http/handlers.go
index 59116cc..34d7644 100644
--- a/pkg/http/handlers.go
+++ b/pkg/http/handlers.go
@@ -304,6 +304,10 @@ func HandleClusterMembers(w http.ResponseWriter, r *http.Request, agent *cluster
 }
 
 func HandleClusterEvent(w http.ResponseWriter, r *http.Request, agent *cluster.Agent) {
+	if agent == nil {
+		writeError(w, "cluster agent is not initialized", http.StatusInternalServerError)
+		return
+	}
 	var req clusterEventRequest
 	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
 		writeError(w, err.Error(), http.StatusBadRequest)