Index: /trunk/FACT++/src/Converter.cc
===================================================================
--- /trunk/FACT++/src/Converter.cc	(revision 11481)
+++ /trunk/FACT++/src/Converter.cc	(revision 11482)
@@ -775,5 +775,5 @@
         const string n = what[3]; // counter
 
-        const int cnt = stoi(n);
+        const int cnt = n.empty() ? 0 : stoi(n);
 
         // if the :N part was not given assume 1