Index: trunk/MagicSoft/Mars/mmontecarlo/MMcCollectionAreaCalc.cc
===================================================================
--- trunk/MagicSoft/Mars/mmontecarlo/MMcCollectionAreaCalc.cc	(revision 1646)
+++ trunk/MagicSoft/Mars/mmontecarlo/MMcCollectionAreaCalc.cc	(revision 1715)
@@ -130,7 +130,15 @@
 Bool_t MMcCollectionAreaCalc::Process()
 {
-//    *fLog << all << fMcEvt << " " << (int)fAllEvtsTriggered << " " << fCollArea << endl;
-    const Float_t energy = fMcEvt->GetEnergy();
-    const Float_t impact = fMcEvt->GetImpact()/100.;
+    const Double_t energy = fMcEvt->GetEnergy();
+    const Double_t impact = fMcEvt->GetImpact()/100.;
+
+    //
+    // This happens for camera files created with Camera 0.5
+    //
+    if (TMath::IsNaN(impact))
+    {
+        *fLog << err << dbginf << "ERROR - Impact=NaN (Not a number)... abort." << endl;
+        return kERROR;
+    }
 
     if (!fAllEvtsTriggered)