dwgread: object & entity are empty in all the cases in v0.13.3.88_2711

[64sys]

Hi,
Quite some time ago I used dwgread v12 ... to extract dwg data in JSON format. In the JSON each object or entity had a value in the key “object” or “entity” as the case may be, but now they are all with null value.
Am I doing something wrong or is it a bug?

{
"entity": "", <--------- all are empty, also "object" key
"index": 137,
"type": 1,
"handle": [0,2,8373],
"size": 75,
"bitsize": 552,
"eed": [
....

Thanks
Martin