--- a/rust/hedgewars-engine/src/main.rs	Sat Nov 05 17:48:45 2022 +0100
+++ b/rust/hedgewars-engine/src/main.rs	Sat Nov 12 15:40:20 2022 +0100
@@ -112,7 +112,7 @@
 
         let engine_state = &mut *engine.start_engine.deref()();
 
-        let port: String = matches.opt_str("port").unwrap();
+        let port: String = matches.opt_str("port").expect("Need IPC port number!");
 
         println!("PORT: {}", port);