angularjs - TypeError: Cannot read property '0' of null (Javascript/Angular) -

i'm running relatively strange error here.

in controller, have array defined.

$scope.results = []; 

on ng-keyup event, fire method:

$scope.search = function() {      myservice.findstuff($scope.mymodel.searchterms).success(function(response)     {     $scope.results = response; }); 

on first keyup, search fires, returns result, , updates dom results:

<div ng-repeat="thing in results">{{ thing.name }}</div> 

everything work perfectly, on first keypress.

afterwards, i'm getting error:

typeerror: cannot read property '0' of null 

this crashes angular app , i'm out lunch.

edit: should clarify, error thrown before of code in $scope.search executes. no query server fired, no console logging executed, nothing.

i've tracked down $scope.results = response;. line removed, queries repeatedly fire no issue. i've noticed if try change results manually (ie. on keypress $scope.results = [{ name: "spaz" }], works on initial firing not on subsequent firings.

i'm going nuts! what's up?!