[Minor] Return nil if unknown processor was used

1 files changed, 7 insertions, 0 deletions

diff --git a/lualib/lua_selectors.lua b/lualib/lua_selectors.lua
index 7de1a10d8..21efc4573 100644
--- a/lualib/lua_selectors.lua
+++ b/lualib/lua_selectors.lua
@@ -772,6 +772,7 @@ exports.parse_selector = function(cfg, str)
     lua_util.debugm(M, cfg, 'processed selector %s, args: %s',
         res.selector.name, res.selector.args)
 
+    local it_happened = false
     -- Now process processors pipe
     fun.each(function(proc_tbl)
       local proc_name = proc_tbl[1]
@@ -804,6 +805,7 @@ exports.parse_selector = function(cfg, str)
 
         if not transform_function[proc_name] then
           logger.errx(cfg, 'processor %s is unknown', proc_name)
+          it_happened = true
           return nil
         end
         local processor = lua_util.shallowcopy(transform_function[proc_name])
@@ -815,6 +817,11 @@ exports.parse_selector = function(cfg, str)
       end
     end, fun.tail(sel))
 
+    if it_happened then
+      logger.errx(cfg, 'unknown processor used, exiting')
+      return nil
+    end
+
     table.insert(output, res)
   end