Commentaire sur Rois 2 25:6

And called him to account. He debated with him concerning the oath.³Tzidkiyohu violated his oath of allegiance to Nevuchadnetzar.—Radak ⁴The Gemara in Maseches Nedarim 65a states that Tzidkiyohu had discovered Nevuchadnetzar eating a live, or according to other opinions, an uncooked rabbit. He had him swear that he would never reveal what he had seen. However, Tzidkiyohu had his oath nullified and revealed Nevuchadnetzar's uncivilized behavior. When Nevuchadnetzar found out that people were making fun of him, he realized that Tzidkiyohu had broken his promise.

and they gave judgment upon him: The pronounced upon him the sentence of a rebel and one who breaks his oath. And therefore they killed his sons and blinded Zedekiah's eyes and bound him in fetters and put him in prison until the day of his death, as is mentioned in the book of Jeremiah. (Jeremiah 39:6-7)