Overlord 2(II) help... if anyone knows what im talking about please answer?

in the mission where you have to charge up the old tower heart i got stuck on the last shrine. i had just killed the king salamander and was carrying the heart to the bridge but my minion got stuck. one of them glitched into the wall and i couldnt get him or the heart to move, so i teleported to my tower then back to the closest teleport in the quest area. i'm back at the gnomes now but theres no heart nearby and the path is blocked to get to where i left it. any ideas?