trace-graph: Check for no record in drawing CPU info

If a CPU is empty, the record returned from tracecmd_read_cpu_last()
may be NULL. Account for it.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/trace-graph.c b/trace-graph.c
index d3c7b1f..135e516 100644
--- a/trace-graph.c
+++ b/trace-graph.c
@@ -939,7 +939,7 @@ static void draw_cpu_info(struct graph_info *ginfo, gint cpu, gint x, gint y)
 
         } else {
                 record = tracecmd_read_cpu_last(ginfo->handle, cpu);
-                if (record->ts < time) {
+                if (record && record->ts < time) {
                         if (!check_sched_switch(ginfo, record, &pid, &comm)) {
                                 pid = pevent_data_pid(ginfo->pevent, record);
                                 comm = pevent_data_comm_from_pid(ginfo->pevent, pid);