2 files changed, 6 insertions, 1 deletions

diff --git a/src/keeper.lua b/src/keeper.lua
index 828932e..77bf880 100644
--- a/src/keeper.lua
+++ b/src/keeper.lua
@@ -150,7 +150,6 @@ function send( ud, key, ...)
     local data, limits = tables( ud)
 
     local n = select( '#', ...)
-    if n == 0 then return true end    -- nothing to send
 
     -- Initialize queue for all keys that have been used with ':send()'
     --
diff --git a/src/lanes.c b/src/lanes.c
index e514e6b..ed54b0f 100644
--- a/src/lanes.c
+++ b/src/lanes.c
@@ -295,6 +295,12 @@ LUAG_FUNC( linda_send)
         // make sure the keys are of a valid type
         check_key_types( L, key_i, key_i);
 
+        // make sure there is something to send
+        if( lua_gettop( L) == key_i)
+        {
+                luaL_error( L, "no data to send");
+        }
+
         // convert nils to some special non-nil sentinel in sent values
         keeper_toggle_nil_sentinels( L, key_i + 1, 1);