diff --git a/supysonic/scanner.py b/supysonic/scanner.py
index 6da6d22..a4c0022 100644
--- a/supysonic/scanner.py
+++ b/supysonic/scanner.py
@@ -142,7 +142,7 @@ class Scanner:
         trdict['duration'] = int(tag.info.length)
         trdict['has_art'] = bool(Track._extract_cover_art(path))
 
-        trdict['bitrate']  = (tag.info.bitrate if hasattr(tag.info, 'bitrate') else int(os.path.getsize(path) * 8 / tag.info.length)) // 1000
+        trdict['bitrate']  = int(tag.info.bitrate if hasattr(tag.info, 'bitrate') else os.path.getsize(path) * 8 / tag.info.length) // 1000
         trdict['content_type'] = mimetypes.guess_type(path, False)[0] or 'application/octet-stream'
         trdict['last_modification'] = int(os.path.getmtime(path))
 
@@ -309,7 +309,10 @@ class Scanner:
             if transform:
                 value = transform(value)
             return value if value else default
-        except (KeyError, ValueError):
+        # KeyError: missing tag
+        # IndexError: tag is present but doesn't have any value
+        # ValueError: tag can't be transformed to correct type
+        except (KeyError, IndexError, ValueError):
             return default
 
     def stats(self):
diff --git a/tests/__init__.py b/tests/__init__.py
index d6897a2..6df5548 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -18,6 +18,7 @@ from . import frontend
 from .issue101 import Issue101TestCase
 from .issue129 import Issue129TestCase
 from .issue133 import Issue133TestCase
+from .issue139 import Issue139TestCase
 
 def suite():
     suite = unittest.TestSuite()
@@ -29,6 +30,7 @@ def suite():
     suite.addTest(unittest.makeSuite(Issue101TestCase))
     suite.addTest(unittest.makeSuite(Issue129TestCase))
     suite.addTest(unittest.makeSuite(Issue133TestCase))
+    suite.addTest(unittest.makeSuite(Issue139TestCase))
 
     return suite
 
diff --git a/tests/assets/issue139.aac b/tests/assets/issue139.aac
new file mode 100644
index 0000000..b16037a
Binary files /dev/null and b/tests/assets/issue139.aac differ
diff --git a/tests/assets/issue139.mp3 b/tests/assets/issue139.mp3
new file mode 100644
index 0000000..71f5f72
Binary files /dev/null and b/tests/assets/issue139.mp3 differ
diff --git a/tests/issue139.py b/tests/issue139.py
new file mode 100644
index 0000000..55a93c0
--- /dev/null
+++ b/tests/issue139.py
@@ -0,0 +1,49 @@
+# coding: utf-8
+#
+# This file is part of Supysonic.
+# Supysonic is a Python implementation of the Subsonic server API.
+#
+# Copyright (C) 2019 Alban 'spl0k' Féron
+#
+# Distributed under terms of the GNU AGPLv3 license.
+
+import shutil
+import tempfile
+import unittest
+
+from pony.orm import db_session
+
+from supysonic.db import init_database, release_database
+from supysonic.db import Folder, Track
+from supysonic.managers.folder import FolderManager
+from supysonic.scanner import Scanner
+
+class Issue139TestCase(unittest.TestCase):
+    def setUp(self):
+        self.__dir = tempfile.mkdtemp()
+        init_database('sqlite:')
+        with db_session:
+            FolderManager.add('folder', self.__dir)
+
+    def tearDown(self):
+        release_database()
+        shutil.rmtree(self.__dir)
+
+    @db_session
+    def do_scan(self):
+        scanner = Scanner()
+        folder = Folder.select(lambda f: f.root).first()
+        scanner.scan(folder)
+        scanner.finish()
+        del scanner
+
+    def test_null_genre(self):
+        shutil.copy('tests/assets/issue139.mp3', self.__dir)
+        self.do_scan()
+
+    def test_float_bitrate(self):
+        shutil.copy('tests/assets/issue139.aac', self.__dir)
+        self.do_scan()
+
+if __name__ == '__main__':
+    unittest.main()