Comment 15 for bug 903676

Inkscape 0.48+devel r11259: similar console messages when undoing/redoing filter effects:

Steps to reproduce:
1) open new document
2) open XML Editor, Fill & Stroke
3) draw rectangle
4) blur rectangle by dragging the slider
5) undo

or:
1) open new document
2) open XML Editor, Fill & Stroke
3) draw rectangle
4) blur rectangle by entering a number (e.g. '2')
5) undo
6) redo

or:
1) open new document
2) open XML Editor
3) draw rectangle
4) apply a preset filter effect
   (e.g. 'Bevels > Bloom' or 'Shadows and Glows > Drop Shadow…')
5) undo
6) redo