diff --git a/lua-temp/TODO.md b/lua-temp/TODO.md
index 1fa0c36..d4ece75 100644
--- a/lua-temp/TODO.md
+++ b/lua-temp/TODO.md
@@ -9,7 +9,7 @@ Progress of the Lua port:
   - [x] Calling functions
   - [x] Calling functions with parameters
 - [ ] Control flow
-  - [ ] Lablels in Assembly
+  - [ ] Labels in Assembly
   - [ ] Recursion
 - [ ] Strings
   - [ ] From constants
diff --git a/lua-temp/tests.lua b/lua-temp/tests.lua
index 0af4028..c5eb8d4 100644
--- a/lua-temp/tests.lua
+++ b/lua-temp/tests.lua
@@ -71,6 +71,31 @@ do TEST "Parser"
     assert_eq(found, expected)
 end
 
+--do TEST "Parser: labels"
+--
+--    local source = [[
+--        .func 0
+--            jmp     %my_label
+--            pushi   3
+--        %my_label:
+--            ret ]]
+--
+--    local expected = {
+--        constants = {},
+--        functions = {
+--            [0] = {
+--                { "jmp", "%my_label" },
+--                { "pushi", 3 },
+--                { "ret", labels = { "%my_label" } },
+--            }
+--        }
+--    }
+--
+--    local found = assemble(source)
+--    pprint(found)
+--    assert_eq(found, expected)
+--end
+
 ----------------------
 --                  --
 --      STACK       --
@@ -137,7 +162,7 @@ local function arith(a, b, op)
 end
 
 
-do TEST("VM: basic")
+do TEST "VM: basic"
     local vm = VM:new()
     -- vm.debug = true
     local bytecode = assemble [[
@@ -159,7 +184,7 @@ do TEST("VM: basic")
     assert_eq(vm:to_integer(-1), 5)
 end
 
-do TEST("VM: logic/arithmetic")
+do TEST "VM: logic/arithmetic"
     assert_eq(arith(2, 5, 'sum'):to_integer(-1), 7)
     assert_eq(arith(2, 5, 'sub'):to_integer(-1), -3)
     assert_eq(arith(2, 5, 'mul'):to_integer(-1), 10)
@@ -181,7 +206,7 @@ do TEST("VM: logic/arithmetic")
     assert_eq(arith(20, 3, 'mod'):to_integer(-1), 2)
 end
 
-do TEST("VM: local variables")
+do TEST "VM: local variables"
     local vm = VM:new():load(assemble([[
         .func 0
             pushv 2         ; local a, b
@@ -197,7 +222,7 @@ do TEST("VM: local variables")
     assert_eq(vm:to_integer(-1), 3)
 end
 
-do TEST("VM: functions")
+do TEST "VM: functions"
     local vm = VM:new():load(assemble([[
         .func 0
             pushf   1
diff --git a/lua-temp/tyche-as.lua b/lua-temp/tyche-as.lua
index 29d78e6..0fd8c40 100644
--- a/lua-temp/tyche-as.lua
+++ b/lua-temp/tyche-as.lua
@@ -17,7 +17,7 @@ local function assemble(source)
         local line = line:gsub("%s*;.*$", "")   -- remove comments
         line = line:match("^%s*(.-)%s*$")       -- trim
 
-        if #line == 1 then goto continue end
+        if #line == 0 then goto continue end
 
         if line == ".const" then
             section = 'const'
@@ -28,6 +28,7 @@ local function assemble(source)
             current_f_id = f_id
         elseif section == 'const' then
             local k, v = line:match("^%s*(%d+)%s*:%s*(.+)$")
+            if not k then error("Invalid row for constant") end
             if v:sub(1, 1) == '"' then
                 proto.constants[tonumber(k)] = line:match('"(.*)"')
             else
@@ -39,6 +40,7 @@ local function assemble(source)
                 table.insert(proto.functions[current_f_id], { inst, tonumber(par) })
             else
                 local inst = line:match("^%s*(%a+)%s*$")
+                if not inst then error("Invalid row for function") end
                 table.insert(proto.functions[current_f_id], { inst })
             end
         end