Index: trunk/FACT++/src/rootifysql.cc
===================================================================
--- trunk/FACT++/src/rootifysql.cc	(revision 19421)
+++ trunk/FACT++/src/rootifysql.cc	(revision 19423)
@@ -528,5 +528,6 @@
         throw runtime_error("Only splitting by --split-sequence or --split-quantile is allowed.");
 
-    const size_t num_split = ::max(split_seq.size(), split_quant.size()+1);
+    const size_t num_split = split_seq.size()+split_quant.size()==0 ? 0 :
+        ::max(split_seq.size(), split_quant.size()+1);
 
     map<size_t, size_t> split_lut;