diff --git a/cmd/update-useragent/main.go b/cmd/update-useragent/main.go
index e3b6ba1..2f2a61b 100644
--- a/cmd/update-useragent/main.go
+++ b/cmd/update-useragent/main.go
@@ -23,6 +23,9 @@ func main() {
 	flag.Parse()
 
 	userAgents := getUserAgents()
+	if len(userAgents) == 0 {
+		log.Fatal("Couldn't get user agents. The user agent data will remain unchanged.")
+	}
 	data, err := json.Marshal(userAgents)
 	if err != nil {
 		log.Fatal(err)