--- wallpapoz-0.6.2/share/wallpapoz/lib/wallpapoz_system.py.default	2012-09-18 12:31:45.855406125 +0900
+++ wallpapoz-0.6.2/share/wallpapoz/lib/wallpapoz_system.py	2012-09-18 12:37:03.387072341 +0900
@@ -108,6 +108,7 @@
     if wm_name=='Xfwm4':
       self.window_manager = 'XFCE4'
     else:
+     try:
       output = os.popen("gnome-session --version")
       result = output.readlines()
       version = result[0].split()[1].split('.')[0]
@@ -115,6 +116,9 @@
         self.window_manager = 'Gnome'
       elif version == '3':
         self.window_manager = 'Gnome3'
+     except:
+      # If something went wrong, just ignore
+      pass
 
   ## class method to find amount of workspaces in user desktop
   def finding_total_workspaces(self):