diff --git a/logdata_visualization/logdata_visualization.pde b/logdata_visualization/logdata_visualization.pde
index 0348728..67e29e2 100644
--- a/logdata_visualization/logdata_visualization.pde
+++ b/logdata_visualization/logdata_visualization.pde
@@ -2,6 +2,9 @@ import processing.serial.*;
 
 int vis_textsize=12; //copy from Visualization class
 
+//String logfile_name="LOG00008_rumfahren_neu.TXT";
+String logfile_name="LOG00180_random.TXT";
+
 boolean useSerial=false; //false=read from csv log, true=read from serial port
 Serial serial;
 String serialString=""; //last read string
@@ -78,7 +81,7 @@ void setup() {
     serialString = serial.readStringUntil(serial_endchar);
     serialString = null;
   }else{
-    logdata = loadTable("LOG00008_rumfahren_neu.TXT", "header, csv");
+    logdata = loadTable(logfile_name, "header, csv");
   
     println("loaded "+logdata.getRowCount()+" lines. Times: "+logdata.getRow(0).getFloat("time")+"s to "+logdata.getRow(logdata.getRowCount()-1).getFloat("time")+"s");
   }
@@ -242,7 +245,7 @@ void draw() {
       throttle=row.getInt("throttle");
       brake=row.getInt("brake");
           
-      if (loopmillis-nextTime>1000) {//too much behind
+      if (loopmillis-nextTime>1000 && nextTime>lastTimeData) {//too much behind
         long _timestep=nextTime-lastTimeData; //approximated time step
         nextID+=(loopmillis-nextTime)/_timestep* 0.9; //fast forward estimated time steps
       }