{
calcMan.notifyStart(this); // updatingConservation = true;
- while (!calcMan.notifyWorking(this))
+ while ((calcMan != null) && (!calcMan.notifyWorking(this)))
{
try
{
ex.printStackTrace();
}
}
- if (alignViewport.isClosed())
+ if ((alignViewport == null) || (calcMan == null)
+ || (alignViewport.isClosed()))
{
abortAndDestroy();
return;