[Minor] Avoid NaN values

diff --git a/lualib/meta_functions.lua b/lualib/meta_functions.lua
index 1394204c15c96a6a78fb51443fec6052e48e9d2d..1c6d2cc2bcda8938d0909dc77760dfd4fb98ec48 100644 (file)
--- a/lualib/meta_functions.lua
+++ b/lualib/meta_functions.lua
@@ -255,8 +255,14 @@ local function meta_words_function(task)
     short_words,
     ret_len,
   }
+
+  local divisor = 1.0
+  if #tp > 0 then
+    divisor = tp
+  end
+
   for _,wr in ipairs(wres) do
-    table.insert(ret, wr / #tp)
+    table.insert(ret, wr / divisor)
   end
 
   return ret