diff --git a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
index 4504b06..de46be0 100644
--- a/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
+++ b/Axel/src/de/hs_mannheim/informatik/spreadsheet/Spreadsheet.java
@@ -126,8 +126,13 @@ public class Spreadsheet {
 			result = "TODO"; // TODO
 		else if (formula.startsWith("MAX("))  // e.g. MAX(A1:A10) -> Standardabweichung
 			result = "TODO"; // TODO
-		else if (!formula.isEmpty())
-			result = "" + calculate(formula);
+		else if (!formula.isEmpty()) {
+			try {
+				result = "" + calculate(formula);
+			} catch(ArithmeticException ae) {
+				result = "exc.";
+			}
+		}
 
 		cells[row][col].setValue("" + result);
 	}
@@ -153,7 +158,7 @@ public class Spreadsheet {
 	 * @param formula The expression to be evaluated.
 	 * @return The result calculated.
 	 */
-	private long calculate(String formula) {
+	private long calculate(String formula) throws ArithmeticException {
 		Matcher m = Pattern.compile("([A-Z][0-9]*)|[-\\+\\*/]|[0-9]*").matcher(formula);
 
 		long res = 0;