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Chapter 1, page 32, xocde 10.3, mojavi(10.14.6(18G95)

cmd run ?
lldb) po [$rdi setHidden:!(BOOL)[$rdi isHidden]]; [CATransaction flush]

error: Execution was interrupted, reason: EXC_BAD_ACCESS (code=1, address=0xc0000000020).

Solution??

@lolgrep Can you please help with this when you get a chance? Thank you - much appreciated! :]

Need more context, please provide a stack trace