diff --git a/.github/ISSUE_TEMPLATE.md b/.github/ISSUE_TEMPLATE.md
index 5b72032bc..7ee704e48 100644
--- a/.github/ISSUE_TEMPLATE.md
+++ b/.github/ISSUE_TEMPLATE.md
@@ -6,8 +6,8 @@
 
 ---
 
-### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.08.06*. If it's not, read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.
-- [ ] I've **verified** and **I assure** that I'm running youtube-dl **2017.08.06**
+### Make sure you are using the *latest* version: run `youtube-dl --version` and ensure your version is *2017.08.09*. If it's not, read [this FAQ entry](https://github.com/rg3/youtube-dl/blob/master/README.md#how-do-i-update-youtube-dl) and update. Issues with outdated version will be rejected.
+- [ ] I've **verified** and **I assure** that I'm running youtube-dl **2017.08.09**
 
 ### Before submitting an *issue* make sure you have:
 - [ ] At least skimmed through the [README](https://github.com/rg3/youtube-dl/blob/master/README.md), **most notably** the [FAQ](https://github.com/rg3/youtube-dl#faq) and [BUGS](https://github.com/rg3/youtube-dl#bugs) sections
@@ -35,7 +35,7 @@ Add the `-v` flag to **your command line** you run youtube-dl with (`youtube-dl
 [debug] User config: []
 [debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
 [debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
-[debug] youtube-dl version 2017.08.06
+[debug] youtube-dl version 2017.08.09
 [debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
 [debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
 [debug] Proxy map: {}
diff --git a/ChangeLog b/ChangeLog
index 084e98c0e..b28ade446 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,14 @@
-version <unreleased>
+version 2017.08.09
+
+Core
+* [utils] Skip missing params in cli_bool_option (#13865)
 
 Extractors
+* [xxxymovies] Fix title extraction (#13868)
++ [nick] Add support for nick.com.pl (#13860)
+* [mixcloud] Fix play info decryption (#13867)
+* [20min] Fix embeds extraction (#13852)
+* [dplayit] Fix extraction (#13851)
 + [niconico] Support videos with multiple formats (#13522)
 + [niconico] Support HTML5-only videos (#13806)
 
diff --git a/test/test_utils.py b/test/test_utils.py
index 7803e5bc7..2aab16b97 100644
--- a/test/test_utils.py
+++ b/test/test_utils.py
@@ -1182,6 +1182,10 @@ part 3</font></u>
             cli_bool_option(
                 {'nocheckcertificate': False}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
             ['--check-certificate=true'])
+        self.assertEqual(
+            cli_bool_option(
+                {}, '--check-certificate', 'nocheckcertificate', 'false', 'true', '='),
+            [])
 
     def test_ohdave_rsa_encrypt(self):
         N = 0xab86b6371b5318aaa1d3c9e612a9f1264f372323c8c0f19875b5fc3b3fd3afcc1e5bec527aa94bfa85bffc157e4245aebda05389a5357b75115ac94f074aefcd
diff --git a/youtube_dl/extractor/mixcloud.py b/youtube_dl/extractor/mixcloud.py
index 0efbe660a..40cd2e389 100644
--- a/youtube_dl/extractor/mixcloud.py
+++ b/youtube_dl/extractor/mixcloud.py
@@ -54,15 +54,22 @@ class MixcloudIE(InfoExtractor):
     }]
 
     # See https://www.mixcloud.com/media/js2/www_js_2.9e23256562c080482435196ca3975ab5.js
-    @staticmethod
-    def _decrypt_play_info(play_info):
-        KEY = 'pleasedontdownloadourmusictheartistswontgetpaid'
-
+    def _decrypt_play_info(self, play_info, video_id):
+        KEYS = (
+            'pleasedontdownloadourmusictheartistswontgetpaid',
+            '(function() { return new Date().toLocaleDateString(); })()'
+        )
         play_info = base64.b64decode(play_info.encode('ascii'))
-
-        return ''.join([
-            compat_chr(compat_ord(ch) ^ compat_ord(KEY[idx % len(KEY)]))
-            for idx, ch in enumerate(play_info)])
+        for num, key in enumerate(KEYS, start=1):
+            try:
+                return self._parse_json(
+                    ''.join([
+                        compat_chr(compat_ord(ch) ^ compat_ord(key[idx % len(key)]))
+                        for idx, ch in enumerate(play_info)]),
+                    video_id)
+            except ExtractorError:
+                if num == len(KEYS):
+                    raise
 
     def _real_extract(self, url):
         mobj = re.match(self._VALID_URL, url)
@@ -78,8 +85,8 @@ class MixcloudIE(InfoExtractor):
 
         encrypted_play_info = self._search_regex(
             r'm-play-info="([^"]+)"', webpage, 'play info')
-        play_info = self._parse_json(
-            self._decrypt_play_info(encrypted_play_info), track_id)
+
+        play_info = self._decrypt_play_info(encrypted_play_info, track_id)
 
         if message and 'stream_url' not in play_info:
             raise ExtractorError('%s said: %s' % (self.IE_NAME, message), expected=True)
diff --git a/youtube_dl/extractor/nick.py b/youtube_dl/extractor/nick.py
index b688637bc..510b1c41f 100644
--- a/youtube_dl/extractor/nick.py
+++ b/youtube_dl/extractor/nick.py
@@ -75,7 +75,7 @@ class NickIE(MTVServicesInfoExtractor):
 
 class NickDeIE(MTVServicesInfoExtractor):
     IE_NAME = 'nick.de'
-    _VALID_URL = r'https?://(?:www\.)?(?P<host>nick\.de|nickelodeon\.(?:nl|at))/(?:playlist|shows)/(?:[^/]+/)*(?P<id>[^/?#&]+)'
+    _VALID_URL = r'https?://(?:www\.)?(?P<host>nick\.(?:de|com\.pl)|nickelodeon\.(?:nl|at))/[^/]+/(?:[^/]+/)*(?P<id>[^/?#&]+)'
     _TESTS = [{
         'url': 'http://www.nick.de/playlist/3773-top-videos/videos/episode/17306-zu-wasser-und-zu-land-rauchende-erdnusse',
         'only_matching': True,
@@ -88,6 +88,9 @@ class NickDeIE(MTVServicesInfoExtractor):
     }, {
         'url': 'http://www.nickelodeon.at/playlist/3773-top-videos/videos/episode/77993-das-letzte-gefecht',
         'only_matching': True,
+    }, {
+        'url': 'http://www.nick.com.pl/seriale/474-spongebob-kanciastoporty/wideo/17412-teatr-to-jest-to-rodeo-oszolom',
+        'only_matching': True,
     }]
 
     def _extract_mrss_url(self, webpage, host):
diff --git a/youtube_dl/extractor/twentymin.py b/youtube_dl/extractor/twentymin.py
index 4fd1aa4bf..a42977f39 100644
--- a/youtube_dl/extractor/twentymin.py
+++ b/youtube_dl/extractor/twentymin.py
@@ -50,7 +50,7 @@ class TwentyMinutenIE(InfoExtractor):
     @staticmethod
     def _extract_urls(webpage):
         return [m.group('url') for m in re.finditer(
-            r'<iframe[^>]+src=(["\'])(?P<url>(?:https?://)?(?:www\.)?20min\.ch/videoplayer/videoplayer.html\?.*?\bvideoId@\d+.*?)\1',
+            r'<iframe[^>]+src=(["\'])(?P<url>(?:(?:https?:)?//)?(?:www\.)?20min\.ch/videoplayer/videoplayer.html\?.*?\bvideoId@\d+.*?)\1',
             webpage)]
 
     def _real_extract(self, url):
diff --git a/youtube_dl/extractor/xxxymovies.py b/youtube_dl/extractor/xxxymovies.py
index 5c8f17eb2..e34ebe3a6 100644
--- a/youtube_dl/extractor/xxxymovies.py
+++ b/youtube_dl/extractor/xxxymovies.py
@@ -39,8 +39,8 @@ class XXXYMoviesIE(InfoExtractor):
             r"video_url\s*:\s*'([^']+)'", webpage, 'video URL')
 
         title = self._html_search_regex(
-            [r'<div class="block_header">\s*<h1>([^<]+)</h1>',
-             r'<title>(.*?)\s*-\s*XXXYMovies\.com</title>'],
+            [r'<div[^>]+\bclass="block_header"[^>]*>\s*<h1>([^<]+)<',
+             r'<title>(.*?)\s*-\s*(?:XXXYMovies\.com|XXX\s+Movies)</title>'],
             webpage, 'title')
 
         thumbnail = self._search_regex(
diff --git a/youtube_dl/utils.py b/youtube_dl/utils.py
index fdf5e29e7..c9cbd5842 100644
--- a/youtube_dl/utils.py
+++ b/youtube_dl/utils.py
@@ -2733,6 +2733,8 @@ def cli_option(params, command_option, param):
 
 def cli_bool_option(params, command_option, param, true_value='true', false_value='false', separator=None):
     param = params.get(param)
+    if param is None:
+        return []
     assert isinstance(param, bool)
     if separator:
         return [command_option + separator + (true_value if param else false_value)]
diff --git a/youtube_dl/version.py b/youtube_dl/version.py
index 11d3bf29f..022172375 100644
--- a/youtube_dl/version.py
+++ b/youtube_dl/version.py
@@ -1,3 +1,3 @@
 from __future__ import unicode_literals
 
-__version__ = '2017.08.06'
+__version__ = '2017.08.09'