title: 'invalid context 0x0' after Migration to iOS 9
body: <p>I've migrated the app to iOS 9, and it works as usually, but there three log messages:</p>
  
  <pre><code>&lt;Error&gt;: CGContextSaveGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
  &lt;Error&gt;: CGContextTranslateCTM: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
  &lt;Error&gt;: CGContextRestoreGState: invalid context 0x0. If you want to see the backtrace, please set CG_CONTEXT_SHOW_BACKTRACE environmental variable.
  </code></pre>
  
  <p>Maybe helps that the next message from Crashlytics is:  </p>
  
  <pre><code>[Crashlytics:Crash] Warning: iOS 9 workaround for binary image loading issue in place.
  </code></pre>
  
  <p>Does anybody know how to fix it?</p>