Board Thread:Skyrim/@comment-10323841-20130602023227/@comment-83.117.148.242-20130602151935

Actually I misread the elderscrolls.wikia.com solution to my problem !

Here's the exact problem and solution :

" PC  360   PS3  If the negotiators stop talking and the Dragonborn is unable to talk, they should exit their seat or it will be impossible to continue the creation of the treaty. PC players may use "setstage mq302 300" after the NPC's are seated at the table to complete the quest. Talking to Esbern should continue the quest after that. For the Xbox 360 and PS3 use a previous save that has the older state of Season Unending to reload and finish the quest. "