diff --git a/fs_npc_list.lua b/fs_npc_list.lua
index 5de8654..91ab4d1 100644
--- a/fs_npc_list.lua
+++ b/fs_npc_list.lua
@@ -559,9 +559,10 @@ yl_speak_up.get_fs_show_npc_list = function(pname, selected_row)
 
 	local tmp_liste = {}
 	for k, v in pairs(yl_speak_up.npc_list) do
-		if(level == 2
+		-- show only NPC - not blocks
+		if(type(k) == "number" and (level == 2
 		  or (v.owner and v.owner == pname)
-		  or (v.may_edit and v.may_edit[pname])) then
+		  or (v.may_edit and v.may_edit[pname]))) then
 			table.insert(tmp_liste, k)
 		end
 	end