diff --git a/interface/ri_tk_cmd.py b/interface/ri_tk_cmd.py
index cc36a3b..40aae63 100644
--- a/interface/ri_tk_cmd.py
+++ b/interface/ri_tk_cmd.py
@@ -263,8 +263,11 @@ def list_to_list(list_from, var_from, var_to):
         itm = l_fr[idx]
         del l_fr[idx]
         display.var_dict[var_from].set(value=tuple(l_fr))
-        l_to = list(eval(display.var_dict[var_to].get()))
-        l_to.append(itm)
+        if display.var_dict[var_to].get():
+            l_to = list(eval(display.var_dict[var_to].get()))
+            l_to.append(itm)
+        else:
+            l_to = [ itm ]
         display.var_dict[var_to].set(value=tuple(l_to))
     
 def raid_raw_to_active():