Comment 7 for bug 1387801

Start building a port. Some wares will be unloaded because the game does not know what is going to happen. Destroy the in-construction port. The already unloaded wares are lost, the others remain on the ship. For example, you now have a builder, a quartz, a diamond and two gold on the ship, which is not enough to build another port. When the ship attemps to unload the *next* ware, the crash occurs.