nytprofhtml: panic in visit_nodes_depth_first

[Jay R]

Hi all -

I'm doing some profiling (using Devel::NYTProf 6.04), and the reports are super-helpful, but I notice this error, which is resulting in the flamegraph not showing up (although the other reports do):

Extracting subroutine call data (There were 193480382 of them, so this may take some time, or cancel and use --no-flame to skip this step.) ...
panic at <dir>/nytprofcalls line 219.
Generating nytprof_jm_l1_from_file/all_stacks_by_time.calls failed

That line is:

        die "panic" if $subid eq '0';

But I'm not following what that means, and what I might be able to do to fix the problem. Any guidance would be most welcome.

Thanks,

Jay