Error while implementing md-autocomplete in angular - angularjs

Question

After executing the list in md-autoComplete. I am getting this error while searching. I have given controller name as ctrl and included the $timeout, $q, $log, attaching html and js file.
Please let me know how to fix it. Thanks in advance.
error
ionic.bundle.js:26794 TypeError: Cannot read property 'indexOf' of
null
at filterFn (http://localhost:8100/js/guest-controller.js:102:31)
at Array.filter (native)
at Object.querySearch (http://localhost:8100/js/guest-
controller.js:60:41)
at fn (eval at compile
(http://localhost:8100/lib/ionic/js/ionic.bundle.js:27638:15),
<anonymous>:4:344)
at Scope.$eval
(http://localhost:8100/lib/ionic/js/ionic.bundle.js:30395:28)
at de
(https://ajax.googleapis.com/ajax/libs/angular_material/1.1.0/angular-
material.min.js:13:11563)
at he
(https://ajax.googleapis.com/ajax/libs/angular_material/1.1.0/angular-
material.min.js:13:12420)
at
https://ajax.googleapis.com/ajax/libs/angular_material/1.1.0/angular-
material.min.js:13:8834
at processQueue
(http://localhost:8100/lib/ionic/js/ionic.bundle.js:29127:28)
html file
<div class="form_element_grid auto_fill_info">
<label>Company Name</label>
<md-autocomplete
ng-disabled="ctrl.isDisabled"
md-no-cache="true"
md-selected-item="ctrl.selectedItem"
md-search-text-change="ctrl.searchTextChange(ctrl.searchText)"
md-search-text="ctrl.searchText"
md-selected-item-change="ctrl.selectedItemChange(item)"
md-items="item in ctrl.querySearch(ctrl.searchText)"
md-item-text="item.display"
md-min-length="0"
placeholder="Enter Company Name" required/>
<md-item-template>
<span md-highlight-text="ctrl.searchText" md-highlight-flags="^i">{{item.display}}</span>
</md-item-template>
<md-not-found>
No states matching "{{ctrl.searchText}}" were found.
<a ng-click="ctrl.newState(ctrl.searchText)">Create a new one!</a>
</md-not-found>
</md-autocomplete>
Js file
var self = this;
$scope.guestDetails = guestData.data;
self.searchText = '';
self.simulateQuery = false;
self.isDisabled = false;
// list of `state` value/display objects
self.states = loadAll();
self.querySearch = querySearch;
self.selectedItemChange = selectedItemChange;
self.searchTextChange = searchTextChange;
self.newState = newState;
function newState(state) {
self.states= loadAll();
}
// ******************************
// Internal methods
// ******************************
/**
* Search for states... use $timeout to simulate
* remote dataservice call.
*/
function querySearch (query) {
var results = query ? self.states.filter( createFilterFor(query)
) : self.states,
deferred;
if (self.simulateQuery) {
deferred = $q.defer();
$timeout(function () { deferred.resolve( results ); },
Math.random() * 1000, false);
return deferred.promise;
} else {
return results;
}
}
function searchTextChange(text) {
$log.info('Text changed to ' + text);
}
function selectedItemChange(item) {
$log.info('Item changed to ' + JSON.stringify(item));
}
/**
* Build `states` list of key/value pairs
*/
function loadAll() {
var deliverycomp = $scope.guestDetails;
console.log(deliverycomp);
return deliverycomp.map( function (state) {
return {
value: state.guestId,
display: state.guestName
};
});
}
/**
* Create filter function for a query string
*/
function createFilterFor(query) {
var lowercaseQuery = query;
return function filterFn(state) {
return (state.display.indexOf('lowercaseQuery') === 0);
};
}