title: Error 16755 - Mongo can't extract geo keys
body: <p>I'm a beginnen with mongo and node.js, and in a existing project we have a collection with shops with geolocs. I get the following error (I have removed some fields)</p>
  
  <pre><code>"code" : 16755,
  "errmsg" : "Can't extract geo keys: { _id: ObjectId('566990eea9c7a38740a305a3'), 
  id: 50, guid: \"NL7a09b334-7524-102d-a4ef-00163e5faa0c\", version: 0, owner: 118, 
  published: 1, loc: [ -9999, -9999 ], logo: \"69db95d0-d58d-40cf-80d3-ac80b8c86af8.png\" }  
  can't project geometry into spherical CRS: [ -9999, -9999 ]"
  </code></pre>
  
  <p>when I try to <code>$set</code> some values on the shop. I see that the values -9999, -9999 are not correct but when I try to replace that with (in Robomongo) other values I get the same error. How can I fix this error, so I can edit the values in <code>loc</code> and do a <code>$set</code>?</p>