convert -average error message

[Yadgar]

Hi(gh)!

When trying to run a bash script to generate averaged frames from a sequence of images (all PNG, all 720 by 720 pixels), I got this message (partially in German due to my OS settings):

convert: ../../magick/string.c:845: DestroyStringInfo: Zusicherung [Assurance] »string_info->signature == 0xabacadabUL« nicht erfüllt [not met].
/home/yadgar/scripts/avgfilm.sh: Zeile 72: 26434 Abgebrochen [Aborted]

Is it a problem of ImageMagick, of bash or of my script?

See you in Khyberspace!

Yadgar

[snibgo]

What version of IM? On what platform?

Please provide a reproducible example: the commands and input image(s) that show the problem.