button back navigation bar crash
<p>I have a crash when i click in the back bar in the navigation bar, the crash log is :</p>

<pre><code>-[__NSCFType hidesBottomBarWhenPushed]: unrecognized selector sent to instance 0x2f2480
</code></pre>

<p>what can be the reason of my crash ?</p>

<p>thanks for your answers</p>
