What is Narrated From Al-Askari عليه السلام Regarding the Designation of Al-qa'im

Narrated to us Ali bin Ahmad bin Abdullah bin Abi Abdullah Ali bin Ahmad bin Abdullah bin Ahmad bin Abi Abdullah Barqi: Narrated to us my father from his grandfather Ahmad bin Abi Abdullah from his father from Muhammad bin Abi Umair from Hamza bin Humran and others from As-Sadiq Ja’far bin Muhammad عليه السلام that he said:
“Abu Ja’far Muhammad bin Ali al-Baqir عليه السلام stood in an extremely worried condition leaning on a wall in Medina. A man approached him and said: O Abu Ja’far, what has aggrieved you? If you are worried about the world, you should know that the sustenance of Allah is there and both the good as well as the bad have a share in it. If you are worried about the hereafter, the promise of the powerful Lord is true. Abu Ja’far عليه السلام said: It is not sorrow, I am worried about the mischief of Ibne Zubair. 
That person said: Have you seen anyone fearing Allah but not getting deliverance? Anyone relying on Allah for whom Allah did not suffice? One who took refuge with Allah but whom Allah did not give refuge? Abu Ja’far said: No. That person went away. The Imam was asked: Who was that man? He replied: It was Khizr عليه السلام.”
The author says: The above report is such but in another report it is mentioned that this incident occurred with Ali bin al-Husain عليه السلام.