Python error when using Measuring Vegetation plugin

Question

I am trying to use the Measuring Vegetation plugin and I am getting this error from Python:

Traceback (most recent call last):
  File "C:/Users/NUR/.qgis//python/plugins\mv_plugin\mv_plugin.py", line 141, in canvasMoveEvent
    self.ndvi = (v_nir[0] - v_red[0])/(v_nir[0] + v_red[0])
ZeroDivisionError: float division by zero

Python version:
2.7.2 (default, Jun 12 2011, 15:08:59) [MSC v.1500 32 bit (Intel)]

QGIS version:
1.8.0-Lisboa Lisboa, 6416f38

Python path:

['C:/Users/NUR/.qgis//python/plugins\\sextante', 'C:/PROGRA~2/Quantum GIS Lisboa/apps/qgis/./python', 'C:/Users/NUR/.qgis//python', 'C:/Users/NUR/.qgis//python/plugins', 'C:/PROGRA~2/Quantum GIS Lisboa/apps/qgis/./python/plugins', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\bin\\python27.zip', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\DLLs', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\plat-win', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\lib-tk', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\qgis\\bin', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\site-packages', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\site-packages\\PIL', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\site-packages\\win32', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\site-packages\\win32\\lib', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\site-packages\\Pythonwin', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\Python27\\lib\\site-packages\\wx-2.8-msw-unicode', '~/.qgis/python', 'C:\\PROGRA~2\\Quantum GIS Lisboa\\apps\\qgis\\python\\plugins\\fTools\\tools', 'C:\\Users\\NUR\\.qgis\\python\\plugins\\openlayersov\\logic', 'C:\\Users\\NUR\\.qgis\\python\\plugins\\openlayersov\\gui', '/usr/share/qgis/python']

Could someone help me with it? Actually, I get an error from Python every time I open QGIS.