Checking for released objects.

I'm trying to release some objects, but the code crashes on the release, because I suspect the object has been released already. I tried to check for nil, but this doesn't seem to work
eg:
- (void)f1 {
object = [[Object alloc] init];
- (void)f2 {
[object release];
// object= nil; /* I shouldn't need to do this? */
- (void)f3 {
if (object) // sometimes this still points to a memory address, though the contents of the memory is a bit funny
[object release]; /* code crashes here sometimes because f2() was run
is there a better way to check if an object has been fully released?
BTW: this is all the on iPhone 2.1, so I know the memory management is a little diffferent.

Deallocation does nothing but mark that space as free for subsequent allocations. Uncomment the second line of f2.

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