catch UnicodeDecodeErrors from simplejson.

wakatime/__init__.py

@@ -63,6 +63,9 @@ def parseConfigFile(configFile):
         'verbose': False,
     }
 
+    if not os.path.isfile(configFile):
+        return configs
+
     try:
         with open(configFile) as fh:
             for line in fh:

wakatime/log.py

@@ -25,7 +25,12 @@ class CustomEncoder(json.JSONEncoder):
         if isinstance(obj, bytes):
             obj = bytes.decode(obj)
             return json.dumps(obj)
-        return super(CustomEncoder, self).default(obj)
+        try:
+            encoded = super(CustomEncoder, self).default(obj)
+        except UnicodeDecodeError:
+            obj = obj.decode('utf-8', 'ignore')
+            encoded = super(CustomEncoder, self).default(obj)
+        return encoded
 
 
 class JsonFormatter(logging.Formatter):