[graph-tool] Segmentation fault (core dumped) when running minimize_blockmodel_dl(g, overlap=True)

Hi All, I am experiencing the problem that I always get Segmentation fault (core dumped) and my program does not finish when running state = minimize_blockmodel_dl(g, overlap=True) When overlap=False, there is no problem. I have the 2.24 graph-tool version installed from Ubuntu repo. I tried this with both python2.7 and python3 -- in both cases, I get the segmentation fault error. Also, this is not due to the size of my graph, I tried with a toy example with only 10 nodes, it still happens. Any ideas what I could do are very much appreciated. Thanks, Sanja