diff --git a/src/simulator/machine.rs b/src/simulator/machine.rs
index 5ba058b..4c7ea58 100644
--- a/src/simulator/machine.rs
+++ b/src/simulator/machine.rs
@@ -208,9 +208,13 @@ impl Machine {
 	/// ### Parameters
 	/// 
 	/// - **machine** which contains a table of instructions
-	pub fn run(&mut self){
-		while let Ok(()) = Machine::one_instruction(self) {}
-		println!("trace : \n{}", self.registers_trace);
+	pub fn run(&mut self) {
+		loop {
+			match Machine::one_instruction(self) {
+				Ok(()) => (),
+				Err(e) => panic!("FATAL at pc {} -> {}", self.pc, e)
+			}
+		}
 	}
 
 	/// Execute the current instruction