javascript - error while using async in node.js -

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i trying write restapi using express framework , node.js. facing error unable find out root cause. getting following error while trying execute code :

typeerror: cannot read property 'node_type' of undefined 'node_type' value comes function

var gdbprocess = require('../../dao/gdb/processnds') var mongo = require('mongodb'); var async = require('async');  exports.executeservice =  function(req,res){ //make process object query var manualprocessquery = new object(); manualprocessquery.index = req.params.processmap; manualprocessquery.key = "pid"; manualprocessquery.value = req.params.pid; manualprocessquery.event = req.params.event;  var tempdatanodetoexecute = new object(); //this function returns  object (datanodetoexecute) execute gdbprocess.getparametersbynode(manualprocessquery,function(err,datanodetoexecute){     if(err) res.send(err);     tempdatanodetoexecute = datanodetoexecute;     var issystem = false;     if (tempdatanodetoexecute.node_type =="system"){         issystem = true;     }      var count = 0;      async.whilst(         function () { return issystem },         function (callback) {             //execute function             executesystem(datanodetoexecute,function(err,executionstatus){                 if (err) callback(err);                 count++;                 if(executionstatus=="completed"){                     manualprocessquery.value = tempdatanodetoexecute.pid;                     manualprocessquery.event = "completed";                          gdbprocess.getparametersbynode(manualprocessquery,function(err,datanodetoexecute2){                         if(err) callback(err);                         tempdatanodetoexecute = datanodetoexecute2;                         if (tempdatanodetoexecute.node_type == "manual"){                             issystem = false;                         }                      });                      callback();                 }             });         },         function (err) {             if(err) res.send(err);             res.send("success");         }     ); });  }    var executemanual = function(prosnodetoexecute,callback){ //do callback (null); }  var executesystem = function(prosnodetoexecute,callback){ //do callback(null,"completed"); }

when debug code, see node_type available. can me find root problem here ?

remove new object tempdatanodetoexecute , use datanodetoexecute instead of it, , practice check null of object before using property program not crashes.


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