Index: trunk/MagicSoft/Mars/mranforest/MRanForest.cc
===================================================================
--- trunk/MagicSoft/Mars/mranforest/MRanForest.cc	(revision 7804)
+++ trunk/MagicSoft/Mars/mranforest/MRanForest.cc	(revision 8022)
@@ -574,8 +574,8 @@
             //isort[n]=n;
 
-            if(TMath::IsNaN(v[n]))
+            if (!TMath::Finite(v[n]))
             {
                 *fLog << err <<"Event no. "<<n<<", matrix column no. "<<mvar;
-                *fLog << err <<" has the value NaN."<<endl;
+                *fLog << err <<" has a non finite value (eg. NaN)."<<endl;
                 return kFALSE;
             }