Attached patch might solve the issue if you are able to apply and rebuild. I'd like it to be tested before committing.
diff --git a/src/sheet-object-graph.c b/src/sheet-object-graph.c index d85bd98..32942d6 100644 --- a/src/sheet-object-graph.c +++ b/src/sheet-object-graph.c @@ -1074,6 +1074,7 @@ gnm_sogg_prep_sax_parser (SheetObject *so, GsfXMLIn *xin, xmlChar const **attrs, GSF_XML_IN_NODE (GUPPI_PLOT_TYPE, GUPPI_AS_PERCENT, -1, "as_percentage", GSF_XML_CONTENT, NULL, percent_end), GSF_XML_IN_NODE (GUPPI_PLOT_TYPE, GUPPI_SEPARATION, -1, "separation_percent_of_radius", GSF_XML_CONTENT, NULL, separation_end), GSF_XML_IN_NODE (GUPPI_PLOT_TYPE, GUPPI_BUBBLE, -1, "auto_allocate_bubble_size", GSF_XML_CONTENT, NULL, bubble_end), + GSF_XML_IN_NODE (GUPPI_PLOT, GUPPI_PLOT_TYPE, -1, "graph:Type", GSF_XML_NO_CONTENT, NULL, NULL), /* second definition */ GSF_XML_IN_NODE (GUPPI_PLOT, GUPPI_DATA, -1, "graph:Data", GSF_XML_NO_CONTENT, NULL, NULL), GSF_XML_IN_NODE (GUPPI_DATA, GUPPI_SERIES, -1, "graph:Series", GSF_XML_NO_CONTENT, series_start, NULL), GSF_XML_IN_NODE (GUPPI_SERIES, GUPPI_SERIES_DIM, -1, "graph:Dimension", GSF_XML_NO_CONTENT, dim_start, NULL),
