NG-CLICK opening modal only firing once in list

I have an ion-item within ion-list using ng-repeat

<ion-item ng-if="children" ng-repeat="child in children" class="item item-button-right item-avatar">
            <button ng-click="editChild(child)" class="button button-positive">
                <i class="icon icon ion-edit"></i>

When the controller is first loaded, the click event is firing and it hits my function in my controller and opens the modal.
All subsequent clicks give me this error:

TypeError: fn is not a function
at $parseFunctionCall (ionic.bundle.js:21045)
at ionic.bundle.js:53458
at Scope.$eval (ionic.bundle.js:23100)
at Scope.$apply (ionic.bundle.js:23199)
at HTMLButtonElement.<anonymous> (ionic.bundle.js:53457)
at HTMLButtonElement.eventHandler (ionic.bundle.js:11713)
at triggerMouseEvent (ionic.bundle.js:2863)
at tapClick (ionic.bundle.js:2852)
at HTMLDocument.tapMouseUp (ionic.bundle.js:2925)

Not sure if I am doing anything wrong, this is standard Angular stuff??

Can you also add controller source code?

Sorry for late reply, been away, this issue is still not resolved, let me know if you need the full controller code.

$ionicModal.fromTemplateUrl('templates/secure/add-edit-child.html', {
    scope: $scope,
    animation: 'slide-in-up'
}).then(function (modal) {
    $scope.modal = modal;

 $scope.editChild = function (child) {
    $scope.mode = 'edit';
    $scope.editChild = child;