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iOS Afnetwork 3.0 crash: Attempted to create a task in a session that has been invalidated

I am getting a rare crash when I invalidate and cancel AFNetwork session when a user logs out. This is the code I am using right now.

[manager.session invalidateAndCancel];


However, this doesn't work all the time. I get the following crash error.

Attempted to create a task in a session that has been invalidated

This is what requests are being made usually from the App before users logs out and it crashes (I simplified it).

- (void)getFirstData {
[manager GET:url
parameters:nil
progress:nil
success:^(NSURLSessionTask *task, id responseObject) {
[self getSecondData];
}
failure:^(NSURLSessionTask *operation, NSError *error) {

}];
}

- (void)getSecondData {
[manager GET:url
parameters:nil
progress:nil
success:^(NSURLSessionTask *task, id responseObject) {

}
failure:^(NSURLSessionTask *operation, NSError *error) {

}];
}


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