bootstrap3.x popover报错Cannot read property 'off' of null

最近在使用bootstrap3x的popover实现openlayer的弹出框的时候，控制台总是报错：Cannot read property ‘off’ of null或者Cannot read property ‘trigger’ of null。
根据我的理解，改源码的complete方法和destroy方法（tooltip.js第633行和tooltip.js第380行）：

      var complete = function () {var prevHoverState = that.hoverStatenull!=that.$element && that.$element.trigger('shown.bs.' + that.type)//380that.hoverState = nullif (prevHoverState == 'out') that.leave(that)}Tooltip.prototype.destroy = function () {var that = thisclearTimeout(this.timeout)this.hide(function () {null!=that.$element && that.$element.off('.' + that.type).removeData('bs.' + that.type)//633if (that.$tip) {that.$tip.detach()}that.$tip = nullthat.$arrow = nullthat.$viewport = nullthat.$element = null})}

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bootstrap3.x popover报错Cannot read property 'off' of null

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