未捕获RangeError：JSON.stringify处的字符串长度无效

Question

                $scope.loader.isSaving = true;
                var json = {
                    spread: $scope.spread.toJSON()
                };
                $scope.flatForm.jsonForm = JSON.stringify(json);
                //console.log(JSON.stringify(json).replace(/\"/g, "\\\""));
                $timeout.cancel(delay);
                delay = $timeout(function() {
                    SpreadSheetService.save($scope.spread);
                }, 300);

当我运行上面的代码时，我遇到了这样的错误。

    Uncaught RangeError: Invalid string length
        at JSON.stringify (<anonymous>)
        at Object.doneFunction (spreadSheetController.js:631)
        at HTMLButtonElement.g (sweet-alert.min.js:1)
    (anonymous) @ spreadSheetController.js:631
    g @ sweet-alert.min.js:1

如何修复此错误？ 请帮帮我。