diff --git a/src/monitor/process.go b/src/monitor/process.go
index 9c428e7..f8f5d8e 100644
--- a/src/monitor/process.go
+++ b/src/monitor/process.go
@@ -53,8 +53,10 @@ func (s Process) List(m *ice.Message, arg ...string) {
 		m.Push("vms", kit.FmtSize(mem.VMS))
 		m.Push("cs", len(conn))
 		m.Push("fs", fd)
-		m.Push("reads", kit.FmtSize(rw.ReadBytes))
-		m.Push("writes", kit.FmtSize(rw.WriteBytes))
+		if rw != nil {
+			m.Push("reads", kit.FmtSize(rw.ReadBytes))
+			m.Push("writes", kit.FmtSize(rw.WriteBytes))
+		}
 		m.Push("user", user)
 		m.Push("name", name)
 		m.Push("cmd", kit.Select(name, cmd))