" The kernel appears to have died. It will restart automatically"

[ricsatjr]

Describe the bug
Extracting an initialized country-level OSM object (output of OSM()) causes kernel to die with the message, "The kernel appears to have died. It will restart automatically", when I attempt to extract features from it (e.g., osm.get_boundaries()', osm.get_pois()`).

The extraction works if I extract from an initialized city-level OSM object. But when I try to extract the country-level OSM object using a bbox of the city level, the kernel still dies.

To Reproduce
Steps to reproduce the behavior:
from pyrosm import get_data
from pyrosm.pyrosm import OSM
pbf_dir="/home/.../PlanetOSM/
pbf_name="czech_republic
fp=get_data(pbf_name,directory=pbf_dir)
osm=OSM(fp)
#successful so far at this point, but kernel dies after executing any of the commands below
boundaries = osm.get_boundaries()
pois= osm.get_pois(custom_filter={'amenity': True, "shop": True})

If we use pbf_name="Prag" (city-level), the above commands are successful.
But if we use pbf_name=czech_republic, and a bbox OSM(fp,bbox=[min x, min y, max x, max y]), representing the Prag total boundaries, the get_boundaries() and get_pois() commands fail.`

Expected behavior
I expect the extraction of boundaries and pois to be successful even for the country-level pbf files. (I got a 16GB RAM, which I think should be fine for the job.
Moreso, when I use the bbox (equivalent to the city), I should be able to extract those features since the data is smaller (and I was previously successful with working on the city-level pbf).

Environment:

• OS: Lubuntu 21.10
• Python package source: conda-forge
• Versions of Python (3.10.6), Pyrosm (0.6.1)