diff --git a/src/lua-scripts/nind_denoise_rl.lua b/src/lua-scripts/nind_denoise_rl.lua
index 4441c25..56fbddc 100644
--- a/src/lua-scripts/nind_denoise_rl.lua
+++ b/src/lua-scripts/nind_denoise_rl.lua
@@ -80,7 +80,7 @@ local function migrate_pref(key, type, default)
     return dt.preferences.read(MODULE_NAME, key, type)
   end)
 
-  if success then
+  if success and value ~= nil and value ~= "" then
     return value
   end
   return default
@@ -919,4 +919,4 @@ script_data.destroy = destroy
 return script_data
 
 -- vim: shiftwidth=2 expandtab tabstop=2 cindent syntax=lua
--- kate: hl Lua;
\ No newline at end of file
+-- kate: hl Lua;