title: Xcode - My app crash and the error is "Invalid pointer dequeued from free list *** set a breakpoint in malloc_error_break to debug"
body: <p>My app runs perfect on simulator.
  But when I run it on device the app crash and display error :</p>
  
  <blockquote>
    <p>"malloc: <strong>* error for object 0x17415d0c0: Invalid pointer dequeued
    from free list
    *</strong> set a breakpoint in malloc_error_break to debug";</p>
  </blockquote>
  
  <p>I searched and set a breakpoint in <code>malloc_error_break</code> to debug, but still cannot find the problem. I tried to changed the scheme of project, enabled Zombie Object, but can not find the answer.</p>
  
  <p>I also try to use instrument, but I am not good at it.</p>