fixed cluster bug

lib/network/modules/Clustering.js

@@ -9,6 +9,8 @@ class ClusterEngine {
     this.options = {};
     this.defaultOptions = {};
     util.extend(this.options, this.defaultOptions);
+
+    this.body.emitter.on('_resetData', () => {this.clusteredNodes = {};})
   }
 
   setOptions(options) {