You are looping the markersArray by a for-in loop:

  for (i in markersArray) {
    markersArray[i].setMap(null);
  }

Prototype.js library adds some methods to every Array. The for-in loop
finds those methods too. It is always safer to use the 'normal' for
loop.

for (var i=0; i<markersArray.length; i++)

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