graph disappears randomly using hide on mouseover about sigma.js HOT 1 CLOSED

// Bind events :
sigInst.bind('overnodes',function(event){
   var nodes = event.content;
   var neighbors = {};
   var nrEdges = 0;
   sigInst.iterEdges(function(e){
      if(nodes.indexOf(e.source)>=0 || nodes.indexOf(e.target)>=0){
         neighbors[e.source] = 1;
         neighbors[e.target] = 1;
        nrEdges++;
      }
   }).iterNodes(function(n){
      if(nrEdges>0) {
         if(!neighbors[n.id]){
         n.hidden = 1;
         }else{
         n.hidden = 0;
         }
     }
   }).draw(2,2,2);
}).bind('outnodes',function(){
   sigInst.iterEdges(function(e){
      e.hidden = 0;
   }).iterNodes(function(n){
      n.hidden = 0;
     }).draw(2,2,2);
   });