diff --git a/replacer/main.go b/replacer/main.go
index a3fb537..4d93489 100644
--- a/replacer/main.go
+++ b/replacer/main.go
@@ -74,6 +74,13 @@ func main() {
 			break
 		}
 
+		if proc == nil {
+			stdlog.Println("FindProcess returns proc nil")
+			break
+		}
+
+		stdlog.Println("found proc :", proc.Pid)
+
 		err = proc.Signal(syscall.Signal(0))
 		if err == nil {
 			break