Using SVG throws an error

[hchouhan]

WordPress/gutenberg#36603 (comment)

[hchouhan]

Solution by @strarsis

The SVG support plugins I have tried all don't filter the image dimensions of SVGs, at least incompletely
(see these posts/issues for plugin SVG Support; Safe SVG; WP SVG images).

A non-zero fallback would also suffice to fix this issue.

function _svg_dims_fallback_is_svg($image_attachment_id)
{
    $image_mime_type = get_post_mime_type($image_attachment_id);
    return 'image/svg+xml' === $image_mime_type;
}

function svg_dims_fallback($image, $attachment_id, $size, $icon)
{
    if (!_svg_dims_fallback_is_svg($attachment_id)) {
        return $image; // skip non-SVGs
    }

    // set some non-zero defaults to prevent division by zero in Gutenberg site-logo render
    if(!isset($image[1]) or $image[1] === 0) {
        $image[1] = 1;
    }
    if(!isset($image[2]) or $image[2] === 0) {
        $image[2] = 1;
    }

    return $image;
}
add_filter( 'wp_get_attachment_image_src', 'svg_dims_fallback', 10, 4 );

The filter has to be set up in a plugin so it runs before the Gutenberg site logo render function.