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-rw-r--r--fsm.go2
1 files changed, 1 insertions, 1 deletions
diff --git a/fsm.go b/fsm.go
index a2ec938..d061995 100644
--- a/fsm.go
+++ b/fsm.go
@@ -60,7 +60,7 @@ func (f *FSM) initalState() stateFn {
func (f *FSM) readDistance() stateFn {
ev := <-f.events
log.Println(ev)
- if ev.Head.Distance < 20 {
+ if ev.Head != nil && ev.Head.Distance < 20 {
return f.stop
}
return f.moveAhead