diff --git a/TULIP/src/lu/list/itis/dkd/tui/utility/Point.java b/TULIP/src/lu/list/itis/dkd/tui/utility/Point.java
index 5f6d5c8f09920290b379887f9009522f625cd122..0af4997faf8d38604dacc1af46e9c343e66390e6 100644
--- a/TULIP/src/lu/list/itis/dkd/tui/utility/Point.java
+++ b/TULIP/src/lu/list/itis/dkd/tui/utility/Point.java
@@ -279,9 +279,23 @@ public class Point extends Float {
      * @pre point.state equal to state iff point != null
      */
     public Point add(@Nullable Point point) {
-        if (point == null)
+        if (point == null) {
             return this;
-        Preconditions.checkArgument(point.getState().getClass().getName().equals(state.getClass().getName()));
+        }
+        switch (state.getClass().getSimpleName()) {
+            case "TableCoordinates":
+                point.toTableCoordinates();
+                break;
+            case "ScreenCoordinates":
+                point.toScreenCoordinates();
+                break;
+            case "CameraCoordinates":
+                point.toCameraCoordinates();
+                break;
+            default:
+                System.err.println("This should never happen! State: " + state.toString());
+                break;
+        }
 
         Point clone = clone();
         clone.setLocation(clone.x + point.x, clone.y + point.y);