[igraph] At structure_generators.c:84 : Invalid (negative) vertex id, Invalid vertex id

[Stephan Schlögl]

Hi,
I'm using igraph in R. I'm trying to compute:

graph <-bipartite.projection(g)

but I get the following error:

At structure_generators.c:84 : Invalid (negative) vertex id, Invalid vertex id

this seems strange to me because I'm not using negative vertex ids.

> min(V(g)$name)
[1] "100000090"
#(not sure if this is the correct way to prove this, since $name seems to be a string)

I suppose the only way to make this reproducible is by providing the graph object

I would gratefull for any help!
Best,
stephan