diff --git a/src/google_map.js b/src/google_map.js
index c47613e..c4f365a 100644
--- a/src/google_map.js
+++ b/src/google_map.js
@@ -1,7 +1,7 @@
 /* eslint-disable import/no-extraneous-dependencies, react/forbid-prop-types, no-console, no-undef */
 import React, { Component } from 'react';
 import PropTypes from 'prop-types';
-import ReactDOM from 'react-dom';
+import ReactDOM, { flushSync } from 'react-dom';
 
 // helpers
 import GoogleMapMap from './google_map_map';
@@ -703,7 +703,9 @@ class GoogleMap extends Component {
             this_._onChildMouseMove();
 
             if (this_.markersDispatcher_) {
-              this_.markersDispatcher_.emit('kON_CHANGE');
+              flushSync(() => {
+                this_.markersDispatcher_.emit('kON_CHANGE');
+              })
               if (this_.fireMouseEventOnIdle_) {
                 this_.markersDispatcher_.emit('kON_MOUSE_POSITION_CHANGE');
               }
diff --git a/src/google_map_markers.js b/src/google_map_markers.js
index e2fbb66..b672702 100644
--- a/src/google_map_markers.js
+++ b/src/google_map_markers.js
@@ -93,7 +93,7 @@ export default class GoogleMapMarkers extends Component {
     this.props.dispatcher.removeListener('kON_CLICK', this._onChildClick);
     this.props.dispatcher.removeListener('kON_MDOWN', this._onChildMouseDown);
 
-    this.dimensionsCache_ = null;
+    this.dimensionsCache_ = {};
   }
 
   _getState = () => ({