Error: property missing ':' when SVG is inline

[Triloworld]

Error:

Message:
    .../styles.css:50:46161: property missing ':'
Details:
    reason: property missing ':'
    filename: .../styles.css
    source: =utf-8,<svg xmlns="http://www.w3.org/2000/svg"><filter id="filter"><feGaussianBlur stdDeviation="50" /></filter></svg>#filter');filter:blur(50px);z-index:0}

To reproduce, add this to css:
filter:url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg"><filter id="filter"><feGaussianBlur stdDeviation="50" /></filter></svg>#filter');

I think, charset=utf-8 is problem for bless.
It is bug or I cannot add inline SVG when dealing with bless?