diff --git a/Valutakalkulator/src/Valutakalkulator/AppController.java b/Valutakalkulator/src/Valutakalkulator/AppController.java
index c8c9a5fa1c2561b5640c22b433c482ef4e467390..bd46ef0cb728e5abade357f6ace5fb181ed4f1e1 100644
--- a/Valutakalkulator/src/Valutakalkulator/AppController.java
+++ b/Valutakalkulator/src/Valutakalkulator/AppController.java
@@ -5,7 +5,7 @@ import javafx.scene.control.ComboBox;
 import javafx.scene.control.TextField;
 
 public class AppController {
-    
+
    @FXML
 	private TextField input, output; 
 	
@@ -27,10 +27,15 @@ public class AppController {
     }
 
     private double getInput() {
-		if(input.getText().isEmpty())
+        String txt=input.getText();
+		if(txt.isEmpty())
 			return 0.0;
-
-		return Double.parseDouble(input.getText());
+        try {  
+            double nr = Double.parseDouble(txt); 
+            return nr;
+        } catch(NumberFormatException e){  
+            return 0.0;  
+        }  
 	}
 	
 	@FXML