Special character in SVG-text-nodes will cause a XML error 5617

[herr-barus]

Special character like öäüß in SVG-text-nodes will cause a XML error 5617 when using window.btoa for base64 encoding.
console:
SVG.toDataURL: using native renderer for png export. THIS MIGHT FAIL.
SVG.toDataURL: using standard XMLSerializer.serializeToString
SVG.toDataURL: using window.btoa for base64 encoding
XML5617: Ungültiges XML-Zeichen. Zeile: 9, Spalte 163

Forcing a custom encoding using the base64.js will work in actual FF, Chrome & Opera, but throws a SecurityError in IE in line 95 of svg_todataurl.js.
console:
SVG.toDataURL: using native renderer for png export. THIS MIGHT FAIL.
SVG.toDataURL: using standard XMLSerializer.serializeToString
SVG.toDataURL: using custom base64 encoder
SVG.toDataURL: exported image size: 0,0
SCRIPT5022: SecurityError Datei: svg_todataurl.js, Zeile: 95, Spalte: 1

[ghost]

I can confirm the error.

I also tried to encode the character using unicode:
ä ---> ä

Still failed with following errors:

SVG.toDataURL: using native renderer for png export. THIS MIGHT FAIL.
svg_todataurl.js:46 SVG.toDataURL: using standard XMLSerializer.serializeToString
svg_todataurl.js:46 SVG.toDataURL: using window.btoa for base64 encoding
svg_todataurl.js:136 Can't export! Maybe your browser doesn't support SVG in img element or SVG input for Canvas drawImage?
http://en.wikipedia.org/wiki/SVG#Native_support

[bailon]

I have the exact same issue from the cases above. It happens with almost every "special character", such as ä, é, €.

I could fix this using the following method before using the lib:
unescape(encodeURIComponent(svgData))