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js错误提示

TypeError: a is null
if (a.text() == '') {

判断为空串前是否要判断为空，回车键为什么会去找a标签，有点疑问。

K(doc).keyup(function(e) {
if (e.which != 13 || e.shiftKey || e.ctrlKey || e.altKey) {
return;
}
if (newlineTag == 'br') {
return;
}
if (_GECKO) {
var root = self.cmd.commonAncestor('p');
var a = self.cmd.commonAncestor('a');
if (a.text() == '') {
a.remove(true);
self.cmd.range.selectNodeContents(root[0]).collapse(true);
self.cmd.select();
}
return;
}