Comment 6 for bug 249035

I'm seeing a similar issue. To reproduce:

Write a simple extension that sets the current layer's style to "display:none". (see attachments)
Run the extension
Undo

Result:
ERROR:document-undo.cpp:173:void sp_document_maybe_done(SPDocument*, const gchar*, unsigned int, Glib::ustring): assertion failed: (doc->priv->sensitive)

Happens on 0.46 and current SVN.