diff --git a/README.md b/README.md
index 4e1296f..e28708a 100644
--- a/README.md
+++ b/README.md
@@ -404,6 +404,9 @@ Property       |     |Type     |Description
 ---------------------------------------
 ## <a id="Release-Note">Release Note</a>
 
+* v0.2.2 (2019-11-24)
+  * Fixed a bug that the `txPower` of iBeacon was wrong. ([Thanks to @girtgirt](https://github.com/futomi/node-beacon-scanner/pull/12))
+  * Fixed a bug that an exception was thrown whenever it received an advertisement packet without service data. ([Thanks to @charlesread](https://github.com/futomi/node-beacon-scanner/issues/11))
 * v0.2.1 (2019-11-02)
   * Fixed a typo of a property name in the [`BeaconScannerAdvertisement` object for Eddystone](#BeaconScannerAdvertisement-object-eddystone) (`namespece` -> `namespace`). ([Thanks to @natcl](https://github.com/futomi/node-beacon-scanner/pull/10))
 * v0.2.0 (2019-10-25)
diff --git a/lib/parser-ibeacon.js b/lib/parser-ibeacon.js
index c18ee7b..24180e6 100644
--- a/lib/parser-ibeacon.js
+++ b/lib/parser-ibeacon.js
@@ -1,9 +1,9 @@
 /* ------------------------------------------------------------------
 * node-beacon-scanner - parser-ibeacon.js
 *
-* Copyright (c) 2017, Futomi Hatano, All rights reserved.
+* Copyright (c) 2017-2019, Futomi Hatano, All rights reserved.
 * Released under the MIT license
-* Date: 2017-09-06
+* Date: 2019-11-24
 * ---------------------------------------------------------------- */
 'use strict';
 
diff --git a/lib/parser.js b/lib/parser.js
index a89f00c..b609e3d 100644
--- a/lib/parser.js
+++ b/lib/parser.js
@@ -3,7 +3,7 @@
 *
 * Copyright (c) 2017-2018, Futomi Hatano, All rights reserved.
 * Released under the MIT license
-* Date: 2018-06-24
+* Date: 2019-11-24
 * ---------------------------------------------------------------- */
 'use strict';
 
@@ -14,7 +14,7 @@ const mEddystone = require('./parser-eddystone.js');
 /* ------------------------------------------------------------------
 * Constructor: EstimoteAdvertising()
 * ---------------------------------------------------------------- */
-const BeaconParser = function() {
+const BeaconParser = function () {
 	// Private properties
 	this._ESTIMOTE_TELEMETRY_SERVICE_UUID = 'fe9a';
 	this._ESTIMOTE_COMPANY_ID = 0x015d;
@@ -25,15 +25,14 @@ const BeaconParser = function() {
 * Method: parse(peripheral)
 * - peripheral: `Peripheral` object of the noble
 * ---------------------------------------------------------------- */
-BeaconParser.prototype.parse = function(peripheral) {
+BeaconParser.prototype.parse = function (peripheral) {
 	let ad = peripheral.advertisement;
-	let manu = ad.manufacturerData;
 	let res = {
-		id                : peripheral.id,
-		address           : peripheral.address,
-		localName         : ad.localName || null,
-		txPowerLevel      : ad.txPowerLevel || null,
-		rssi              : peripheral.rssi
+		id: peripheral.id,
+		address: peripheral.address,
+		localName: ad.localName || null,
+		txPowerLevel: ad.txPowerLevel || null,
+		rssi: peripheral.rssi
 	};
 
 	let beacon_type = this._detectBeaconType(peripheral);
@@ -41,25 +40,25 @@ BeaconParser.prototype.parse = function(peripheral) {
 	let parsed = null;
 
 	// iBeacon
-	if(beacon_type === 'iBeacon') {
+	if (beacon_type === 'iBeacon') {
 		parsed = mIbeacon.parse(peripheral);
-	// Eddystone
-	} else if(beacon_type === 'eddystoneUid') {
+		// Eddystone
+	} else if (beacon_type === 'eddystoneUid') {
 		parsed = mEddystone.parseUid(peripheral);
-	} else if(beacon_type === 'eddystoneUrl') {
+	} else if (beacon_type === 'eddystoneUrl') {
 		parsed = mEddystone.parseUrl(peripheral);
-	} else if(beacon_type === 'eddystoneTlm') {
+	} else if (beacon_type === 'eddystoneTlm') {
 		parsed = mEddystone.parseTlm(peripheral);
-	} else if(beacon_type === 'eddystoneEid') {
+	} else if (beacon_type === 'eddystoneEid') {
 		parsed = mEddystone.parseEid(peripheral);
-	// Estimote
-	} else if(beacon_type === 'estimoteTelemetry') {
+		// Estimote
+	} else if (beacon_type === 'estimoteTelemetry') {
 		parsed = mEstimote.parseTelemetry(peripheral);
-	} else if(beacon_type === 'estimoteNearable') {
+	} else if (beacon_type === 'estimoteNearable') {
 		parsed = mEstimote.parseNearable(peripheral);
 	}
 
-	if(parsed) {
+	if (parsed) {
 		res[beacon_type] = parsed;
 		return res;
 	} else {
@@ -67,39 +66,43 @@ BeaconParser.prototype.parse = function(peripheral) {
 	}
 };
 
-BeaconParser.prototype._detectBeaconType = function(peripheral) {
+BeaconParser.prototype._detectBeaconType = function (peripheral) {
 	let ad = peripheral.advertisement;
 	let manu = ad.manufacturerData;
 	// Eddiystone
-	let eddystone_service = ad.serviceData.find((el) => {
-		return el.uuid === this._EDDYSTONE_SERVICE_UUID;
-	});
-	if(eddystone_service  && eddystone_service.data) {
-		// https://github.com/google/eddystone/blob/master/protocol-specification.md
-		let frame_type = eddystone_service.data.readUInt8(0) >>> 4;
-		if(frame_type === 0b0000) {
-			return 'eddystoneUid';
-		} else if(frame_type === 0b0001) {
-			return 'eddystoneUrl';
-		} else if(frame_type === 0b0010) {
-			return 'eddystoneTlm';
-		} else if(frame_type === 0b0011) {
-			return 'eddystoneEid';
+	if (ad.serviceData) {
+		let eddystone_service = ad.serviceData.find((el) => {
+			return el.uuid === this._EDDYSTONE_SERVICE_UUID;
+		});
+		if (eddystone_service && eddystone_service.data) {
+			// https://github.com/google/eddystone/blob/master/protocol-specification.md
+			let frame_type = eddystone_service.data.readUInt8(0) >>> 4;
+			if (frame_type === 0b0000) {
+				return 'eddystoneUid';
+			} else if (frame_type === 0b0001) {
+				return 'eddystoneUrl';
+			} else if (frame_type === 0b0010) {
+				return 'eddystoneTlm';
+			} else if (frame_type === 0b0011) {
+				return 'eddystoneEid';
+			}
 		}
 	}
 	// iBeacon
-	if(manu && manu.length >= 4 && manu.readUInt32BE(0) === 0x4c000215) {
+	if (manu && manu.length >= 4 && manu.readUInt32BE(0) === 0x4c000215) {
 		return 'iBeacon';
 	}
 	// Estimote Telemetry
-	let telemetry_service = ad.serviceData.find((el) => {
-		return el.uuid === this._ESTIMOTE_TELEMETRY_SERVICE_UUID;
-	});
-	if(telemetry_service  && telemetry_service.data) {
-		return 'estimoteTelemetry';
+	if (ad.serviceData) {
+		let telemetry_service = ad.serviceData.find((el) => {
+			return el.uuid === this._ESTIMOTE_TELEMETRY_SERVICE_UUID;
+		});
+		if (telemetry_service && telemetry_service.data) {
+			return 'estimoteTelemetry';
+		}
 	}
 	// Estimote Nearable
-	if(manu && manu.length >= 2 && manu.readUInt16LE(0) === this._ESTIMOTE_COMPANY_ID) {
+	if (manu && manu.length >= 2 && manu.readUInt16LE(0) === this._ESTIMOTE_COMPANY_ID) {
 		return 'estimoteNearable';
 	}
 	// Unknown
diff --git a/package.json b/package.json
index 3189fa3..0c55662 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "node-beacon-scanner",
-  "version": "0.2.1",
+  "version": "0.2.2",
   "description": "The node-beacon-scanner is a Node.js module which allows you to scan BLE beacon packets and parse the packet data. This module supports iBeacon, Eddystone, and Estimote.",
   "main": "./lib/scanner.js",
   "files": [