Dear all, I am currently using Gretl 2018d-git (2018-10-11) on Win10 (actually the same happens on Linux). Trying to read a bundle where some list is empty results in an error: <hansl> clear open denmark.gdt -q bundle b = null list L = LRM b.L = L list X = null # putting "LRY" into the list would work b.X = X print b bwrite(b, "foob") bundle b2 = bread("foob") print b2 # results in: 'X': got NULL data value </hansl> Best, Artur