diff --git a/lib/session.js b/lib/session.js
index 11f47a1..02b526b 100644
--- a/lib/session.js
+++ b/lib/session.js
@@ -310,25 +310,22 @@ function sendReturn(pdu, status, params, closeAfterSend, callback) {
 		closeAfterSend = undefined;
 	}
 
+	if (typeof callback !== 'function') {
+		callback = function() {};
+	}
+
 	utils.pduReturn(pdu, status, params, function(err, retPdu) {
 		if (err) {
 			log.error('larvitsmpp: lib/session.js: sendReturn() - Could not create return PDU: ' + err.message);
 			that.closeSocket();
 
-			if (typeof callback === 'function') {
-				callback(err);
-			}
-
+			callback(err);
 			return;
 		}
 
 		log.silly('larvitsmpp: lib/session.js: sendReturn() - Sending return PDU: ' + retPdu.toString('hex'));
-
 		that.sockWrite(retPdu, closeAfterSend);
-
-		if (typeof callback === 'function') {
-			callback(null, retPdu);
-		}
+		callback(null, retPdu);
 	});
 }