Ignoring return value of function declared with 'warm_unused_result' attribute SRWebSocket.m

[gbenna]

I am using MQTT-Client-Framework in a project but get the following warning.
Ignoring return value of function declared with 'warm_unused_result' attribute.
This happens twice
Once at line 509

NSMutableData *keyBytes = [[NSMutableData alloc] initWithLength:16];
   SecRandomCopyBytes(kSecRandomDefault, keyBytes.length, keyBytes.mutableBytes);

and at line1499

 uint8_t *mask_key = frame_buffer + frame_buffer_size;
        SecRandomCopyBytes(kSecRandomDefault, sizeof(uint32_t), (uint8_t *)mask_key);
        frame_buffer_size += sizeof(uint32_t);

I am working on a Mac Book Pro running 11.0.1
Xcode 12.3
I installed Frameworks with Cocoapods
My Broker is Adafruit.com

It doesn't seem to be effecting the running of the code. There is no direct message in the logs but still I get this warning.
Any suggestions why and how to get rid of it?