Ember.js "calling set on destroyed object" Error after call to unloadRecord

Within a sessioning system for a project I'm working on, I'm calling unloadRecord on a record like so:

user.unloadRecord();

I'm not calling destroyRecord because I want to manually unload the record from the store without persisting it to the server. Removing the record from the store in this manner works perfectly, but when I log into the same account--which requires loading a the same user record manually using store.push--I get the following error message:

Uncaught Error: Assertion Failed: calling set on destroyed object     ember.js:3902

Again, this occurs at the following line after calling user.unloadRecord():

var user = this.store.push("user", newUser);

Is there any way to avoid this error?