diff --git a/guessit/date.py b/guessit/date.py
index ed38d1ba..0eb612fa 100644
--- a/guessit/date.py
+++ b/guessit/date.py
@@ -31,8 +31,8 @@
 _dsep_bis = r'[-/ \.x]'
 
 date_regexps = [
-    re.compile('[^\d](\d{8})[^\d]', re.IGNORECASE),
-    re.compile('[^\d](\d{6})[^\d]', re.IGNORECASE),
+    re.compile('%s(\d{8})%s' % (_dsep, _dsep), re.IGNORECASE),
+    re.compile('%s(\d{6})%s' % (_dsep, _dsep), re.IGNORECASE),
     re.compile('[^\d](\d{2})%s(\d{1,2})%s(\d{1,2})[^\d]' % (_dsep, _dsep), re.IGNORECASE),
     re.compile('[^\d](\d{1,2})%s(\d{1,2})%s(\d{2})[^\d]' % (_dsep, _dsep), re.IGNORECASE),
     re.compile('[^\d](\d{4})%s(\d{1,2})%s(\d{1,2})[^\d]' % (_dsep_bis, _dsep), re.IGNORECASE),
diff --git a/guessit/language.py b/guessit/language.py
index 7e32af3c..a3098023 100644
--- a/guessit/language.py
+++ b/guessit/language.py
@@ -169,7 +169,7 @@ def reverse(self, name):
     'no', 'non', 'war', 'min', 'new', 'car', 'day', 'bad', 'bat', 'fan',
     'fry', 'cop', 'zen', 'gay', 'fat', 'one', 'cherokee', 'got', 'an', 'as',
     'cat', 'her', 'be', 'hat', 'sun', 'may', 'my', 'mr', 'rum', 'pi', 'bb', 'bt',
-    'tv', 'aw', 'by', 'md', 'mp', 'cd', 'lt', 'gt', 'in', 'ad', 'ice', 'ay',
+    'tv', 'aw', 'by', 'md', 'mp', 'cd', 'lt', 'gt', 'in', 'ad', 'ice', 'ay', 'at',
     # french words
     'bas', 'de', 'le', 'son', 'ne', 'ca', 'ce', 'et', 'que',
     'mal', 'est', 'vol', 'or', 'mon', 'se', 'je', 'tu', 'me',
diff --git a/guessit/matcher.py b/guessit/matcher.py
index 2e3bc2af..cd31d7f2 100644
--- a/guessit/matcher.py
+++ b/guessit/matcher.py
@@ -171,15 +171,16 @@ def build_guess(node, name, value=None, confidence=1.0):
 
         clean_value = node.clean_value
 
-        for i in range(0, len(node.value)):
-            if clean_value[0] == node.value[i]:
-                break
-            left_offset += 1
-
-        for i in reversed(range(0, len(node.value))):
-            if clean_value[-1] == node.value[i]:
-                break
-            right_offset += 1
+        if clean_value:
+            for i in range(0, len(node.value)):
+                if clean_value[0] == node.value[i]:
+                    break
+                left_offset += 1
+
+            for i in reversed(range(0, len(node.value))):
+                if clean_value[-1] == node.value[i]:
+                    break
+                right_offset += 1
 
         guess.metadata().span = (node.span[0] - node.offset + left_offset, node.span[1] - node.offset - right_offset)
     return guess
diff --git a/guessit/test/autodetect.yaml b/guessit/test/autodetect.yaml
index 2c14ed0d..7e2730af 100644
--- a/guessit/test/autodetect.yaml
+++ b/guessit/test/autodetect.yaml
@@ -498,3 +498,10 @@
   episodeNumber: 82
   videoCodec: h264
 
+? "[Figmentos] Monster 34 - At the End of Darkness [781219F1].mkv"
+: type: episode
+  releaseGroup: Figmentos
+  series: Monster
+  episodeNumber: 34
+  title: At the End of Darkness
+  crc32: 781219F1
diff --git a/guessit/transfo/guess_bonus_features.py b/guessit/transfo/guess_bonus_features.py
index c70b31e5..7249b5db 100644
--- a/guessit/transfo/guess_bonus_features.py
+++ b/guessit/transfo/guess_bonus_features.py
@@ -55,10 +55,12 @@ def same_group(g1, g2):
                        if 'filmNumber' in node.guess]
         if film_number:
             film_series = previous_group(film_number[0])
-            found_property(film_series, 'filmSeries', confidence=0.9)
+            if film_series:
+                found_property(film_series, 'filmSeries', confidence=0.9)
 
             title = next_group(film_number[0])
-            found_property(title, 'title', confidence=0.9)
+            if title:
+                found_property(title, 'title', confidence=0.9)
 
         season = [node for node in mtree.leaves() if 'season' in node.guess]
         if season and 'bonusNumber' in mtree.info: