diff --git a/src/ol/geom/multipolygon.js b/src/ol/geom/multipolygon.js
index 214398858a..8c5b4cd885 100644
--- a/src/ol/geom/multipolygon.js
+++ b/src/ol/geom/multipolygon.js
@@ -274,6 +274,14 @@ ol.geom.MultiPolygon.prototype.setCoordinates =
  */
 ol.geom.MultiPolygon.prototype.setFlatCoordinates =
     function(layout, flatCoordinates, endss) {
+  goog.asserts.assert(!goog.isNull(endss));
+  if (goog.isNull(flatCoordinates) || flatCoordinates.length === 0) {
+    goog.asserts.assert(endss.length === 0);
+  } else {
+    goog.asserts.assert(endss.length > 0);
+    var ends = endss[endss.length - 1];
+    goog.asserts.assert(flatCoordinates.length == ends[ends.length - 1]);
+  }
   this.setFlatCoordinatesInternal(layout, flatCoordinates);
   this.endss_ = endss;
   this.dispatchChangeEvent();