h5topng error

[markgeza]

I installed meep on this configuration...
Linux nano02 4.9.0-12-amd64 #1 SMP Debian 4.9.210-1 (2020-01-20) x86_64 GNU/Linux
I installed it with "sudo apt-get install meep", done "sudo apt-get update" and "dist-upgrade" first.
meep runs ok, but when I run h5topng, it produces the (seemingly) corrent png file, but gives error
/usr/bin/h5topng': double free or corruption (out): 0x00007fff6384c370
I tried the other format conversions, to text and vtk, there is no error message there.
Formerly (five year before) I already used meep, this error did not occur back then.
What can I do?
Thank you, Geza