[Minor] Do not pollute logs with strange error message

diff --git a/src/plugins/lua/fann_redis.lua b/src/plugins/lua/fann_redis.lua
index cf65555581a89b5f3d3191a5d9989179fe391cc4..2ca94ef0f5ab4d94f870b1226f16930b5de82e08 100644 (file)
--- a/src/plugins/lua/fann_redis.lua
+++ b/src/plugins/lua/fann_redis.lua
@@ -128,7 +128,7 @@ local redis_lua_script_maybe_load = [[
     return {redis.call('GET', KEYS[1] .. '_data'), ret}
   end
 
-  return tonumber(ret)
+  return tonumber(ret) or 0
 ]]
 local redis_maybe_load_sha = nil