kloud/stack: fix nil ptr deref
kloud/stack: fix nil ptr deref

drewsetski/koding,gokmen/koding,szkl/koding,drewsetski/koding,usirin/koding,koding/koding,usirin/koding,andrewjcasal/koding,mertaytore/koding,drewsetski/koding,usirin/koding,rjeczalik/koding,sinan/koding,sinan/koding,usirin/koding,koding/koding,rjeczalik/koding,koding/koding,andrewjcasal/koding,rjeczalik/koding,acbodine/koding,szkl/koding,rjeczalik/koding,mertaytore/koding,usirin/koding,usirin/koding,andrewjcasal/koding,koding/koding,gokmen/koding,acbodine/koding,drewsetski/koding,acbodine/koding,sinan/koding,koding/koding,cihangir/koding,andrewjcasal/koding,szkl/koding,cihangir/koding,szkl/koding,drewsetski/koding,cihangir/koding,drewsetski/koding,acbodine/koding,cihangir/koding,gokmen/koding,cihangir/koding,cihangir/koding,rjeczalik/koding,drewsetski/koding,acbodine/koding,gokmen/koding,gokmen/koding,sinan/koding,szkl/koding,acbodine/koding,szkl/koding,sinan/koding,gokmen/koding,mertaytore/koding,andrewjcasal/koding,drewsetski/koding,usirin/koding,koding/koding,koding/koding,mertaytore/koding,gokmen/koding,koding/koding,rjeczalik/koding,usirin/koding,sinan/koding,szkl/koding,mertaytore/koding,cihangir/koding,rjeczalik/koding,mertaytore/koding,mertaytore/koding,andrewjcasal/koding,sinan/koding,acbodine/koding,cihangir/koding,gokmen/koding,mertaytore/koding,rjeczalik/koding,andrewjcasal/koding,szkl/koding,andrewjcasal/koding,acbodine/koding,sinan/koding