diff --git a/.github/workflows/luacheck.yml b/.github/workflows/luacheck.yml
new file mode 100644
index 0000000..d00f53a
--- /dev/null
+++ b/.github/workflows/luacheck.yml
@@ -0,0 +1,17 @@
+name: luacheck
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+    - name: apt
+      run: sudo apt-get install -y luarocks
+    - name: luacheck install
+      run: luarocks install --local luacheck
+    - name: luacheck run
+      run: $HOME/.luarocks/bin/luacheck ./
diff --git a/.luacheckrc b/.luacheckrc
new file mode 100644
index 0000000..a5b19ab
--- /dev/null
+++ b/.luacheckrc
@@ -0,0 +1,25 @@
+unused = false
+
+globals = {
+	"minetest",
+	"default",
+	"protector",
+	"register_door",
+	"register_trapdoor"
+}
+
+read_globals = {
+	-- Stdlib
+	string = {fields = {"split"}},
+	table = {fields = {"copy", "getn"}},
+
+	-- Minetest
+	"vector", "ItemStack",
+	"dump", "VoxelArea",
+
+	-- deps
+	"intllib",
+	"mesecon",
+	"screwdriver",
+	"lucky_block"
+}
diff --git a/README.md b/README.md
index 9c79d39..1ba992d 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
 Protector Redo mod [protect]
 
+![](https://github.com/S-S-X/protector/workflows/luacheck/badge.svg)
+
 Protector redo for minetest is a mod that protects a players builds by placing
 a block that stops other players from digging or placing blocks in that area.
 
diff --git a/admin.lua b/admin.lua
index a6a4964..78ba00c 100644
--- a/admin.lua
+++ b/admin.lua
@@ -119,12 +119,12 @@ minetest.register_chatcommand("protector_show", {
 	func = function(name, param)
 
 		local player = minetest.get_player_by_name(name)
-		local pos = player:get_pos()
+		local ppos = player:get_pos()
 
 		-- find the protector nodes
 		local pos = minetest.find_nodes_in_area(
-			{x = pos.x - r, y = pos.y - r, z = pos.z - r},
-			{x = pos.x + r, y = pos.y + r, z = pos.z + r},
+			{x = ppos.x - r, y = ppos.y - r, z = ppos.z - r},
+			{x = ppos.x + r, y = ppos.y + r, z = ppos.z + r},
 			{"protector:protect", "protector:protect2"})
 
 		local meta, owner
diff --git a/doors_chest.lua b/doors_chest.lua
index 46a385a..300e127 100644
--- a/doors_chest.lua
+++ b/doors_chest.lua
@@ -87,9 +87,9 @@ function register_door(name, def)
 	local tt = def.tiles_top
 	local tb = def.tiles_bottom
 
-	local function after_dig_node(pos, name, digger)
+	local function after_dig_node(pos, node_name, digger)
 		local node = minetest.get_node(pos)
-		if node.name == name then
+		if node.name == node_name then
 			minetest.node_dig(pos, node, digger)
 		end
 	end
@@ -340,7 +340,7 @@ end
 
 -- Protected Steel Door
 
-local name = "protector:door_steel"
+name = "protector:door_steel"
 
 register_door(name, {
 	description = S("Protected Steel Door"),
@@ -382,9 +382,9 @@ end
 
 ----trapdoor----
 
-function register_trapdoor(name, def)
-	local name_closed = name
-	local name_opened = name.."_open"
+function register_trapdoor(node_name, def)
+	local name_closed = node_name
+	local name_opened = node_name.."_open"
 
 	def.on_rightclick = function (pos, node, clicker, itemstack, pointed_thing)
 		if minetest.is_protected(pos, clicker:get_player_name()) then
diff --git a/init.lua b/init.lua
index eb95024..6af648a 100644
--- a/init.lua
+++ b/init.lua
@@ -217,7 +217,7 @@ protector.can_dig = function(r, pos, digger, onlyowner, infolevel)
 	end
 
 	-- find the protector nodes
-	local pos = minetest.find_nodes_in_area(
+	pos = minetest.find_nodes_in_area(
 		{x = pos.x - r, y = pos.y - r, z = pos.z - r},
 		{x = pos.x + r, y = pos.y + r, z = pos.z + r},
 		{"protector:protect", "protector:protect2"})
diff --git a/pvp.lua b/pvp.lua
index 0efb62a..1e15f93 100644
--- a/pvp.lua
+++ b/pvp.lua
@@ -48,9 +48,7 @@ and minetest.settings:get_bool("protector_pvp") then
 				-- get time of day
 				local tod = minetest.get_timeofday() or 0
 
-				if tod > 0.2 and tod < 0.8 then
-					--
-				else
+				if tod <= 0.2 or tod >= 0.8 then
 					return false
 				end
 			end