There is a known Issue with Golden Fleece!

Golden Fleece has a 1 in 4 chance of crashing the game and it is currently unknown as to why exactly. It is affected by the amount of areas created, like cliffs, forests etc. The only way to completely stop the crashing thus far is to completely remove the forests and cliffs making the water version more like the random map script Islands - and making the land version played like a werid savannah.

I can confirm that this issue is only present in AoM:EE and is not replicable in AoT - making the fix slightly harder to find.

For the mean time I will revert to the first stable version of the Golden Fleece map which roughly has a 1 in 10 chance of crashing (instead of a 1 in 4).