Comment 4 for bug 1301076

The bug description and steps to reproduce seem to omit basic information: the SVG file in question seems to have been handed-edited (or modified with a custom extension or an external application) - the trigger for the crash AFAICT is related to the internal stylesheet, which defines a custom style for the path with id 'register_glow' which references a filter effect not present in the file:

#register_glow{fill:#d62f1f;fill-opacity:1;stroke:none;filter:url(#filter4815);}

If that filter definition is present - e.g. by adding one with the same id to the <defs> section - the crash does not occur when changing the blur via 'Fill and Stroke' dialog:
<filter
     color-interpolation-filters="sRGB"
     id="filter4815"><feGaussianBlur
       id="feGaussianBlur9999"
       stdDeviation="1.0" /></filter>

Could you share the steps how the internal style sheet is created, and kept up-to-date with the properties in the style attributes of the individual objects?