pandoc crashes if I try to replace an image

I’m writing a filter for pandoc, but if I try to remove images I get an error. Here’s a minimal filter:

from pandocfilters import toJSONFilter, RawBlock


def filter(key, value, format, meta):
    if key == 'Image':
        return RawBlock('html', 'ok')


if __name__ == "__main__":
    toJSONFilter(filter)

Here’s the error:

pandoc: Error in $.blocks[17].c[0]: failed to parse field blocks: failed to parse field c: mempty
CallStack (from HasCallStack):
  error, called at pandoc.hs:144:42 in main:Main

I call pandoc without any extra options, just --filter my_filter.py and -o output.html.

Version:

pandoc 1.19.2.1
Compiled with pandoc-types 1.17.0.4, texmath 0.9, skylighting 0.1.1.4

on Windows 10 x64

[jgm]

Oh, the problem is that you use RawBlock instead of RawInline. An image is an Inline. Sorry, this library doesn’t have very good error reporting. You might try panflute instead!

[mtomassoli]

I solved by replacing the containing Para. Thanks for the help and the library!