diff --git a/Matomat/Automat.cs b/Matomat/Automat.cs
index 8f3ce65..5353f2d 100644
--- a/Matomat/Automat.cs
+++ b/Matomat/Automat.cs
@@ -13,6 +13,10 @@ namespace Matomat
         private LCDDisplay lcd;
         private Input inp;
 
+        public delegate void stopEvent(bool stop);
+
+        public event stopEvent stopThread;
+
         public Automat() {
             lcd = Factory.getLCDDisplay();
             inp = Factory.getInput();
@@ -37,6 +41,19 @@ namespace Matomat
                 {
                     this.sell(prod, user);
                 }
+                if (prod.GetProdType() == Prod.ProdType.instruction)
+                {
+                    switch (prod.GetFunctName())
+                    {
+                        case "exit();": this.stopThread(true); break;
+                        case "aufladen(10);": this.InsAufladen(10); break;
+                        case "aufladen(20);": this.InsAufladen(20); break;
+                        case "aufladen(5);": this.InsAufladen(5); break;
+                        case "addUser();": this.InsAddUser(); break;
+                        case "delUser();": this.InsDelUser(); break;
+                        case "showStats();": this.InsShowStats(); break;
+                    }
+                }
 
                 
             }
@@ -56,7 +73,8 @@ namespace Matomat
                 this.lcd.print("²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²" +
                                "²  Du hast zu viel Geld auf dem Konto  ²" +
                                "²      BITTE bezahlen! | Grenze 20€    ²" +
-                               "²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²", LCDDisplay.Status.Error, 5);
+                               "²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²", 
+                               LCDDisplay.Status.Error, 5);
             }
         }
 
@@ -104,17 +122,12 @@ namespace Matomat
             return new User(userId);
         }
 
-        internal bool die()
-        {
-            return shutdown;
-        }
-
         internal void GetInitStatus()
         {
             lcd.print("²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²abcdef 321" +
-                          "²     MATOMAT Wilkommen!     ²ghijkl 123" +
-                          "²  Frohes genießen der Mate  ²mnopqr 066" +
-                          "²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²stuvwx 001");
+                      "²     MATOMAT Wilkommen!     ²ghijkl 123" +
+                      "²  Frohes genießen der Mate  ²mnopqr 066" +
+                      "²²²²²²²²²²²²²²²²²²²²²²²²²²²²²²stuvwx 001");
         }
     }
 }
diff --git a/Matomat/DBDriverMysqli.cs b/Matomat/DBDriverMysqli.cs
index 1c3e550..a25c3f9 100644
--- a/Matomat/DBDriverMysqli.cs
+++ b/Matomat/DBDriverMysqli.cs
@@ -36,6 +36,8 @@ namespace Matomat
         public override void query(string sql)
         {
             this.err = null;
+            if (this.data is MySqlDataReader && !this.data.IsClosed)
+                this.data.Close();
             this.data = null;
             this.data_b = true;
             if (sql.ToUpper().Substring(0, 6) == "SELECT")
@@ -191,6 +193,7 @@ namespace Matomat
                 }
                 return row;
             }
+            this.data.Close();
             return null;
         }
         public override Exception getError()
diff --git a/Matomat/LCDDisplay.cs b/Matomat/LCDDisplay.cs
index 89b82bf..9c28f77 100644
--- a/Matomat/LCDDisplay.cs
+++ b/Matomat/LCDDisplay.cs
@@ -195,6 +195,8 @@ namespace Matomat
         public void RequestStop()
         {
             _shouldStop = true;
+            if (this.serialPort.IsOpen)
+                this.serialPort.Close();
         }
     }
 }
diff --git a/Matomat/Prod.cs b/Matomat/Prod.cs
index aec9081..1610cee 100644
--- a/Matomat/Prod.cs
+++ b/Matomat/Prod.cs
@@ -28,19 +28,19 @@ namespace Matomat
             if (t == null)
             {
                 this.found = false;
+                return;
+            }
+
+            this.found = true;
+            if (t.iscommand)
+            {
+                this.type = ProdType.instruction;
             }
             else
             {
-                this.found = true;
-                if (t.iscommand)
-                {
-                    this.type = ProdType.instruction;
-                }
-                else
-                {
-                    this.type = ProdType.product;
-                }
+                this.type = ProdType.product;
             }
+
         }
 
         internal bool vaild()
diff --git a/Matomat/User.cs b/Matomat/User.cs
index 0520a2f..bcb207f 100644
--- a/Matomat/User.cs
+++ b/Matomat/User.cs
@@ -12,7 +12,6 @@ namespace Matomat
 
         public User(long userId)
         {
-            // TODO: Complete member initialization
             this.userId = userId;
             load();
         }
@@ -20,9 +19,12 @@ namespace Matomat
         private void load()
         {
             TUser u = new Tables().getUserTable(this.userId);
-            
-            if (true)
-                this.found = true;
+            if (u == null)
+            {
+                this.found = false;
+                return;
+            }
+            this.found = true;
         }
 
         internal bool vaild()
@@ -31,6 +33,7 @@ namespace Matomat
             if (!found)
             {
                 lcd.print("User wurde nich gefunden",LCDDisplay.Status.Error,5);
+                System.Threading.Thread.Sleep(4500);
                 return false;
             }
             return true;
diff --git a/Matomat/Worker.cs b/Matomat/Worker.cs
index 4e56c98..09fcf7e 100644
--- a/Matomat/Worker.cs
+++ b/Matomat/Worker.cs
@@ -18,8 +18,10 @@ namespace Matomat
             rfid = new RFIDReader();
             barcode = new BarcodeReader();
             automat = new Automat();
+            automat.stopThread += new Automat.stopEvent(RequestStop);
             lcd = Factory.getLCDDisplay();
             inp = Factory.getInput();
+            _shouldStop = false;
         }
         public void DoWork()
         {
@@ -29,11 +31,12 @@ namespace Matomat
                 InputData input = inp.getAnyInput(0);
                 automat.doJob(input);
             }
-            Console.WriteLine("worker thread: terminating gracefully.");
+            lcd.print("Matomat Beendet!");
+            lcd.RequestStop();
         }
-        public void RequestStop()
+        private void RequestStop(bool stop)
         {
-            _shouldStop = true;
+            _shouldStop = stop;
         }
 
     }