Index: /trunk/FACT++/src/StateMachineDim.cc
===================================================================
--- /trunk/FACT++/src/StateMachineDim.cc	(revision 14018)
+++ /trunk/FACT++/src/StateMachineDim.cc	(revision 14019)
@@ -111,6 +111,6 @@
     StateMachineImp::AddStateName(state, name, doc);
 
-    const string str0 = reinterpret_cast<char*>(fDescriptionStates.itsData);
-    const string str1 = to_string((long long)state)+':'+name+'=';
+    const string str0 = fDescriptionStates.itsData ? reinterpret_cast<char*>(fDescriptionStates.itsData) : "";
+    const string str1 = to_string(state)+':'+name+'=';
 
     if (str0.find(str1)!=string::npos)