createObjectURL returns null

Question

I use the following code to create URL's for blob's:

var URL = window.URL || window.webkitURL;

URL.createObjectURL(storedBlob);

I ensured that URL method exists, as well as the blob which looks like this from the debugger:

The code works fine on Firefox, Chrome and IE but on Safrari createObjectURL always returns null.

Edit.:

• Creating Object URL for fresh constructed Blob's like in Chris Benselers fiddle works fine.

• I restore the blob from a WEBSQL Database ( I use it with IndexedDBShim )

What is the problem and how to solve it?