Couldn't load plugin fTools due an error when calling its initGui() method

Traceback (most recent call last):
  File "C:/OSGeo4W/apps/qgis-dev/./python\qgis\utils.py", line 213, in startPlugin
    plugins[packageName].initGui()
  File "C:/OSGeo4W/apps/qgis-dev/./python/plugins\fTools\fTools.py", line 190, in initGui
    self.updateThemeIcons("theme")
  File "C:/OSGeo4W/apps/qgis-dev/./python/plugins\fTools\fTools.py", line 69, in updateThemeIcons
    self.analysisMenu.setIcon(QIcon(self.getThemeIcon("analysis.png")))
  File "C:/OSGeo4W/apps/qgis-dev/./python/plugins\fTools\fTools.py", line 59, in getThemeIcon
    themePath = "icons" + QDir.separator() + settings.value("/Themes") + QDir.separator() + icon
TypeError: coercing to Unicode: need string or buffer, NoneType found

Python version:
2.7.4 (default, Apr  6 2013, 19:54:46) [MSC v.1500 32 bit (Intel)]


QGIS version:
1.9.0-Master Master, 95dcd96

Python path: ['C:/OSGeo4W/apps/qgis-dev/./python', 'C:\\Users\\Aren Cambre/.qgis2/python', 'C:\\Users\\Aren Cambre/.qgis2/python/plugins', 'C:/OSGeo4W/apps/qgis-dev/./python/plugins', 'C:\\OSGeo4W\\bin\\python27.zip', 'C:\\OSGeo4W\\apps\\Python27\\DLLs', 'C:\\OSGeo4W\\apps\\Python27\\lib', 'C:\\OSGeo4W\\apps\\Python27\\lib\\plat-win', 'C:\\OSGeo4W\\apps\\Python27\\lib\\lib-tk', 'C:\\OSGeo4W\\bin', 'C:\\OSGeo4W\\apps\\Python27', 'C:\\OSGeo4W\\apps\\Python27\\lib\\site-packages', 'C:\\OSGeo4W\\apps\\Python27\\lib\\site-packages\\PIL', 'C:\\OSGeo4W\\apps\\Python27\\lib\\site-packages\\win32', 'C:\\OSGeo4W\\apps\\Python27\\lib\\site-packages\\win32\\lib', 'C:\\OSGeo4W\\apps\\Python27\\lib\\site-packages\\Pythonwin', 'C:\\OSGeo4W\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicode', 'C:\\OSGeo4W\\apps\\qgis-dev\\python\\plugins\\fTools\\tools']