title: Wordpress error log does not show the location of a specific error
body: <p>The error log usually shows errors and their locations (filenames and line numbers) (or that's what I think). However, I get this error without any information on its location:</p>
  
  <pre><code>Aq_Resize.process() error: $width parameter is required
  </code></pre>
  
  <p>This happens with this error only (the locations of other errors are shown). I enabled <code>WP_DEBUG</code> and <code>WP_DEBUG_LOG</code> but it did not fix the issue.</p>
  
  <p>Why is the location of this error is not shown? How can I know where it occurs to try to fix it?</p>