diff --git a/resources/lib/pydrive/apiattr.py b/resources/lib/pydrive/apiattr.py
index a97f214..fe99700 100644
--- a/resources/lib/pydrive/apiattr.py
+++ b/resources/lib/pydrive/apiattr.py
@@ -21,9 +21,10 @@ class ApiAttribute(object):
 
   def __del__(self, obj=None):
     """Delete value of this attribute."""
-    del obj.attr[self.name]
-    if obj.dirty.get(self.name) is not None:
-      del obj.dirty[self.name]
+    if(obj != None):
+        del obj.attr[self.name]
+        if obj.dirty.get(self.name) is not None:
+            del obj.dirty[self.name]
 
 
 class ApiAttributeMixin(object):