Add checks for nil in minetest.after

diff --git a/builtin/misc.lua b/builtin/misc.lua
index 1d5e146c60cc7b182f88c714ca9b542786bc4417..f91f5e095d7c3a04728463dac19a9557cf9fd891 100644 (file)
--- a/builtin/misc.lua
+++ b/builtin/misc.lua
@@ -21,6 +21,8 @@ minetest.register_globalstep(function(dtime)
 end)
 
 function minetest.after(time, func, ...)
+       assert(tonumber(time) and type(func) == "function",
+                       "Invalid minetest.after invocation")
        table.insert(minetest.timers_to_add, {time=time, func=func, args={...}})
 end