fix bug that caused crash on non-existant stacks
fix bug that caused crash on non-existant stacks

ebensing/dreadnot,pipedrive/dreadnot,racker/dreadnot,fr34k8/dreadnot,fr34k8/dreadnot,ebensing/dreadnot,ebensing/dreadnot,pipedrive/dreadnot,pipedrive/dreadnot,racker/dreadnot,racker/dreadnot