Traceback (most recent call last): File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/webapp/__init__.py", line 636, in __call__ handler.post(*groups) File "/base/data/home/apps/gumroad/1.349498677539326613/main.py", line 292, in post db.delete(link) File "/base/python_runtime/python_lib/versions/1/google/appengine/ext/db/__init__.py", line 1491, in delete datastore.Delete(keys, config=config) File "/base/python_runtime/python_lib/versions/1/google/appengine/api/datastore.py", line 516, in Delete keys, multiple = NormalizeAndTypeCheckKeys(keys) File "/base/python_runtime/python_lib/versions/1/google/appengine/api/datastore.py", line 178, in NormalizeAndTypeCheckKeys keys, multiple = NormalizeAndTypeCheck(keys, (basestring, Entity, Key)) File "/base/python_runtime/python_lib/versions/1/google/appengine/api/datastore.py", line 157, in NormalizeAndTypeCheck (types, val, typename(val))) BadArgumentError: Expected one of (<type 'basestring'>, <class 'google.appengine.api.datastore.Entity'>, <class 'google.appengine.api.datastore_types.Key'>); received None (a NoneType).