Index: /trunk/src/series/merge_proj.m
===================================================================
--- /trunk/src/series/merge_proj.m	(revision 576)
+++ /trunk/src/series/merge_proj.m	(revision 577)
@@ -83,5 +83,5 @@
 end
 
-%% root input file(s) and type
+%% root input file type
 RootPath=Param.InputTable(:,1);
 RootFile=Param.InputTable(:,3);
@@ -221,6 +221,10 @@
             %% check whether tps is needed, then calculate tps coefficients if needed
             check_tps=0;
-            if ischar(Param.InputFields.FieldName)
-                Param.InputFields.FieldName={Param.InputFields.FieldName};
+            if isfield(Param.InputFields,'FieldName')
+                if ischar(Param.InputFields.FieldName)
+                    Param.InputFields.FieldName={Param.InputFields.FieldName};
+                end
+            else
+                Param.InputFields.FieldName={};
             end
             for ilist=1:numel(Param.InputFields.FieldName)