gimp-image-get-filename

[PixLab]

I got errors when trying to set the original name, what did I missed?
It seems to be from the second "if" (first one works fine) "pathchar (car (gimp-image-get-filename image)) ".webp"))"

BTW is there a "else" or sort of in scheme?

Code:

   (while (> i 0)

     (set! image (vector-ref (cadr (gimp-image-list)) (- i 1)))
     
     (if (= KeepName 0)
         (set! newFileName (string-append inDir
                 pathchar inFileName
                 (substring "0000000" (string-length
                 (number->string (+ inFileNumber i))))
                 (number->string (+ inFileNumber (- ii i))) ".webp"))
       )
     (if (= KeepName 1)
         (set! newFileName (string-append inDir
                 pathchar (car (gimp-image-get-filename image)) ".webp"))
     )
   
         (file-webp-save2 isInteractive
                     image
                     (car (gimp-layer-new-from-visible image image "export"))
                     newFileName
                     newFileName