Can't test right now, but can you try to pass an empty string to pandoc.Str('')?

Am 31. Oktober 2021 14:18:16 MEZ schrieb Philipp <philipp.kupferschmied-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>:
>Hello everyone,
>
>I'm experiencing a problem with a self-written Lua-filter after upgrading 
>to 2.15.
>
>The filter ran (and still runs) fine with older versions of pandoc, but 
>with 2.15 I get the following error:
>
>PandocLuaError "Error during function call:\n\tstring expected, got 
>string\n\twhile retrieving function argument string\n\twhile retrieving 
>arguments for function Str\nstack traceback:\n\t[C]: in field 
>'Str'\n\tscripts/klausur.lua:11: in function 
><scripts/klausur.lua:9>\n\t[C]: in ?\n\t[C]: in field 
>'walk_block'\n\tscripts/klausur.lua:8: in function 'processheader'"
>
>stack traceback:
>
>[C]: in field 'walk_block'
>
>scripts/klausur.lua:8: in function 'processheader'
>The corresponding Lua code looks like this (I hope the formatting is 
>preserved):
>
> 7 function processheader(elem)
> 8     return pandoc.walk_block(elem, {
> 9         Str = function(elem)
>10             if string.match(elem.text, "%%%d+p%%") ~= nil then
>11                 return pandoc.Str()
>12             end
>13         end
>14     })
>15 end
>
>I'd be thankful for any suggestion what is going wrong here.
>
>Kind regards,
>Philipp
>
>
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