Memory leak... ESP8266 + 0-length response

I've got my voice recognition program working on a Pico, using EasyVR2.0.
It works - I can say "Switch Desk" and it switches the desk light on/off, etc by sending an http request over the ESP8266.

Unfortunately, there's a problem. Every time it processes a command, it loses 100 jsvars. It's definitely something I'm doing, but I can't figure out if it's a bug in my code that's just my fault, or

I can't read the trace() output effectively - I see tons of stuff duplicated, and I don't know which is the junk that's my user code, and which is an artifact of the output format.

EasyVR.js (idea is - you tell module to setRecognize(), then that sets the timeout. The EasyVR replies that that was successful, triggering the command to start listening. Noise will result in either an error response, or a result response (if the noise was me saying "Nixie" or w/e), and then fires the appropriate callback

exports.connect = function(serial,onCm,onTo,onEr) {
    return new EasyVR(serial,onCm,onTo,onEr);
};

function EasyVR(ser,onCm,onTo,onEr) {
  this.ser = ser;
  this.onCommand=onCm;
  this.onTimeout=onTo;
  this.onErr=onEr;
  this.ser.on('data',this.onData.bind(this));
  this.stop();
  this.vrstate=-1;
  this.stsr='o';
  this.rcvv="";
  this.tout=0;
  this.lstC='';
}

EasyVR.prototype.argchar=function(val) {
	if (val<-1 || val > 31) {throw "Bad arg";}
	return String.fromCharCode(0x41+val);
};

EasyVR.prototype.chararg=function(chr) {
	return chr.charCodeAt(0)-0x41;

}; 

EasyVR.prototype.onData=function(data) {
	//this=evr;
	
	console.log("serial data watch: "+data);
	var rcv=data.charCodeAt(0);
	console.log("serial data: "+rcv);
	if (rcv>0x60) {
		console.log("status");
		//console.log("serial lookup: "+temp);
		if (this.sts_idx[data]["len"]) {
			this.stsr=data;
			this.ser.print(' ');
			console.log("need to get data")
		} else {
			console.log("no data to get")
			this.sts_idx[data]["cb"].bind(this)();
		}
	} else {
		console.log("data");
		this.rcvv+=data;
		if (this.rcvv.length>=this.sts_idx[this.stsr]["len"]){
		    console.log("running callback "+this.sts_idx[this.stsr]["cb"]);
			this.sts_idx[this.stsr]["cb"].bind(this)();
			this.rcvv="";
			this.stsr='o';
		} else {
		    console.log("need more data");
			this.ser.print(' ');
		}
	}

};
EasyVR.prototype.sts_idx={
	"o":{len:0,cb:function(){
		console.log('STS_SUCCESS');
		console.log(this.lstC);
		if (this.lstC=='o')  { 
			console.log(this.vrstate);
			if (this.vrstate!=-1) {
				console.log("kicking off recognize");
				this.sendCmd('d',this.vrstate);
			}
		}
	}},
	"t":{len:0,cb:function() {
		console.log('STS_TIMEOUT');
		if (this.vrstate!=-1){
			console.log("calling onTimeout callback");
			this.onTimeout(this.vrstate);
			this.vrstate=-1;
		}
	}},
	"v":{len:0,cb:function() {
		console.log('STS_INVALID '+this.rcvv);
		if (this.vrstate!=-1){
			this.vrstate=-1;
		}
	}},
	"i":{len:0,cb:function() {
		console.log('STS_INTERR '+this.rcvv);
		if (this.vrstate!=-1){
			this.vrstate=-1;
		}
	}},
	"e":{len:2,cb:function() {
		console.log('STS_ERROR '+this.rcvv);
		if (this.vrstate!=-1){
			console.log("calling onErr callback");
			var tem=this.vrstate;
			this.vrstate=-1;
			this.onErr(tem);
		}
	}},
	"s":{len:1,cb:function() {
		console.log('STS_SIMILAR '+this.rcvv);
		if (this.vrstate!=-1){
			console.log("calling onErr callback");
			var tem=this.vrstate;
			this.vrstate=-1;
			this.onErr(tem);
		}
	}},
	"r":{len:1,cb:function() {
		console.log('STS_RESULT '+this.rcvv);
		if (this.vrstate!=-1){
			console.log("calling onCommand");
			console.log(r);
			var rt = this.onCommand(this.vrstate,this.chararg(this.rcvv));
			this.vrstate=-1;
			if (rt.type!==undefined) {
				this.setRecognize(rt.type,rt.timeout);
			}
		}
	}}
};


EasyVR.prototype.setRecognize=function(type,to) {
	if (this.tout) {
		clearTimeout(this.tout);
		this.tout=0;
	}
	this.vrstate=type;
	this.timeout(to);
};

EasyVR.prototype.sendCmd=function(cmd,arg) {
	//lastCmd=[cmd,arg];
	this.ser.print(cmd);
	console.log("Sending command: "+cmd);
	this.lstC=cmd;
	if (arg!==undefined){console.log("With arg: "+this.argchar(arg));this.ser.print(this.argchar(arg));}
};

EasyVR.prototype.stop=function(){
	this.sendCmd('b');
};
EasyVR.prototype.timeout=function(arg) {
	this.sendCmd('o',arg);
};

EasyVR.prototype.setStrict=function(arg) {
	this.sendCmd('v',E.clip(arg,1,5));
};