diff --git a/callagent/MGCPCallAgent.st b/callagent/MGCPCallAgent.st
index 78be0c3..dd9d1d0 100644
--- a/callagent/MGCPCallAgent.st
+++ b/callagent/MGCPCallAgent.st
@@ -155,7 +155,7 @@ MGCPCallAgentBase subclass: MGCPCallAgent [
             | res data id trans |
             data := aData data copyFrom: 1 to: aData size.
             res := self parser parse: data asString onError: [
-                self error: 'Parse error ', data asByteArray printString.
+                ^ self error: 'Parse error ', data asByteArray printString.
             ].
 
             id := res transactionId asInteger.