wkhtmltopdf + nodejs error after pipe(res) - node.js

Question

i still have a problem with wkhtmltopdf in node js.
I create my html that come from the compiled ejs template.
I create the pdf with the code above and the pdf is perfetct
wkhtmltopdf(html, {
pageSize: information.configPdf.pageSize,
orientation: information.configPdf.orientation,
marginLeft: `${information.configPdf.marginLeft}mm`,
marginTop: `${information.configPdf.marginTop}mm`,
marginRight: `${information.configPdf.marginLeft}mm`,
marginBottom: `${information.configPdf.marginTop}mm`,
printMediaType:true
}).pipe(res);
After this i still have an erorr like this:
::1 - - [01/Jun/2021:08:37:32 +0000] "GET /pdfResult?idStored=11&parametriStored=M8 HTTP/1.1" 200 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36"
events.js:292
throw er; // Unhandled 'error' event
^
Error: Exit with code 1 due to network error: ProtocolUnknownError
wkhtmltopdf exited with code 1
at handleError (/home/mauro/Documenti/Sviluppo/etichetto-Se/node_modules/wkhtmltopdf/index.js:142:16)
at ChildProcess.<anonymous> (/home/mauro/Documenti/Sviluppo/etichetto-Se/node_modules/wkhtmltopdf/index.js:114:7)
at ChildProcess.emit (events.js:315:20)
at Process.ChildProcess._handle.onexit (internal/child_process.js:277:12)
Emitted 'error' event on Socket instance at:
at handleError (/home/mauro/Documenti/Sviluppo/etichetto-Se/node_modules/wkhtmltopdf/index.js:156:14)
at ChildProcess.<anonymous> (/home/mauro/Documenti/Sviluppo/etichetto-Se/node_modules/wkhtmltopdf/index.js:114:7)
at ChildProcess.emit (events.js:315:20)
at Process.ChildProcess._handle.onexit (internal/child_process.js:277:12)
[nodemon] app crashed - waiting for file changes before starting...
I just some week that i'm fighting against it and i can't resolve.
Thanks for your help