"_reduce" not resolved from current namespace (intervals)

[DavorJ]

I occasionally get this error:

Error in .Call("_reduce", x@.Data, closed(x), is(x, "Intervals_full")) : 
  "_reduce" not resolved from current namespace (intervals)

Wasn't able to identify the root cause yet. Anyhow, after the error occurs, ik keeps recurring on specific data. I am using intervals_0.15.2 on R v3.6.3.

[DavorJ]

Just tried intervals_0.15.4 and the issue seems to be resolved, at least on the specific occasion where the previous version was failing with the above error.