If supper is offered then have super 1st even the Isha prayer is continued

وَعَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: إِذَا وُضِعَ عَشَاءُ أَحَدِكُمْ وَأُقِيمَتِ الصَّلَاة فابدؤوا بِالْعَشَاءِ وَلَا يَعْجَلْ حَتَّى يَفْرُغَ مِنْهُ وَكَانَ ابْنُ عُمَرَ يُوضَعُ لَهُ الطَّعَامُ وَتُقَامُ الصَّلَاةُ فَلَا يَأْتِيهَا حَتَّى يَفْرُغُ مِنْهُ وَإِنَّهُ لِيَسْمَعَ قِرَاءَةَ الْإِمَامِ
مُتَّفَقٌ عَلَيْهِ (الألباني) : حكم
Meaning:
He reported the Messenger of Allah صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ as saying, “When one of you is served with his supper and the time for prayer comes, he should first have his supper and not hasten till he has finished it.” When Ibn ‘Umar’s food was served and the time for prayer came, he did not go to the prayer till he finished it; and he could hear the imam’s recitation.
Bukhari and Muslim
Reference : Mishkat al-Masabih 1056