X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fbootchart%2Fsvg.c;fp=src%2Fbootchart%2Fsvg.c;h=bf6636cab1d8c26b0c2f9d12a2baac7869faf863;hb=8271bd16ce9327834d8580e55bb5e4e0896fd98a;hp=81211995292761140f3a9aa7daf90fd8895d7408;hpb=a035f8191addc9422cbe84bf984adcd43134a0db;p=elogind.git

diff --git a/src/bootchart/svg.c b/src/bootchart/svg.c
index 812119952..bf6636cab 100644
--- a/src/bootchart/svg.c
+++ b/src/bootchart/svg.c
@@ -80,6 +80,8 @@ static void svg_header(void) {
         double h;
         struct list_sample_data *sampledata_last;
 
+        assert(head);
+
         sampledata = head;
         LIST_FIND_TAIL(link, sampledata, head);
         sampledata_last = head;