Plaintiff sued to dissolve several LLCs and close corporations. Defendants invoked their right to buy plaintiff’s interests in the companies at appraised value. The parties stipulated to add five additional LLCs to the group of companies being appraised for buyout purposes even though plaintiff had not sued to dissolve them. After the trial court entered a judgment setting the appraised value, defendants did not buy plaintiff’s interest, but instead appealed from the judgment setting the appraised value. Before the appeal was heard, defendants dismissed the appeal. Sometime later they moved to vacate the appraisal judgment claiming it was void since the trial court lacked jurisdiction to appraise the five additional LLCs. This decision holds that even if it was error to add the five LLCs, it was an error that did not deprive the trial court of fundamental subject matter jurisdiction or render its judgment void, so it could be challenged only by a direct attack (as on the dismissed appeal) and not by a later collateral attack (such as the motion to vacate judgment). The decision also holds that defendants are estopped from arguing that the trial court lacked jurisdiction to appraise the five additional LLCs since defendants had asked the trial court to do just that in the stipulation.