diff --git a/abms.lua b/abms.lua
index b800d89..1956fd8 100644
--- a/abms.lua
+++ b/abms.lua
@@ -15,7 +15,6 @@ local fortress_mob_count = 5
 local players_in_orbit = {}
 
 local mushrooms = {"flowers:mushroom_brown", "flowers:mushroom_red"}
-local hunger_mod = minetest.get_modpath("hunger")
 
 
 -- fungal tree nodes
@@ -64,10 +63,18 @@ local fortress_group = {'group:fortress'}
 local firework_active = false
 local function firework()
 	local t = minetest.get_timeofday()
+	if not (t and type(t) == 'number') then
+		return
+	end
+
 	if not firework_active and (t < 0.25 or t > 0.75) then
 		firework_active = true
 		local ps = {}
 		local players = minetest.get_connected_players()
+		if not (players and type(players) == 'table') then
+			return
+		end
+
 		for i = 1, #players do
 			local pp = players[i]:getpos()
 			if pp and pp.y > 0 then
@@ -89,7 +96,14 @@ local function firework()
 end
 
 minetest.register_globalstep(function(dtime)
+	if not (dtime and type(dtime) == 'number') then
+		return
+	end
+
 	local time = minetest.get_gametime()
+	if not (time and type(time) == 'number') then
+		return
+	end
 
 	-- Execute only after an interval.
 	if last_dps_check and time - last_dps_check < dps_delay then
@@ -130,6 +144,10 @@ minetest.register_globalstep(function(dtime)
 	-- Spawn mobs in fortresses -- only when a player is near
 	local minetest_find_nodes_in_area = minetest.find_nodes_in_area
 	local players = minetest.get_connected_players()
+	if not (players and type(players) == 'table') then
+		return
+	end
+
 	local do_fortress_spawns = (fun_caves.fortress_spawns and #fun_caves.fortress_spawns > 0)
 	for i = 1, #players do
 		local player = players[i]
@@ -153,7 +171,11 @@ minetest.register_globalstep(function(dtime)
 			if mob_count < fortress_mob_count then
 				local f1 = vector.subtract(pos, fortress_floor)
 				local f2 = vector.add(pos, fortress_floor)
-				local floor_nodes, count = minetest.find_nodes_in_area_under_air(f1, f2, fortress_group)
+				local floor_nodes = minetest.find_nodes_in_area_under_air(f1, f2, fortress_group)
+				if not (floor_nodes and type(floor_nodes) == 'table') then
+					return
+				end
+
 				if #floor_nodes > 0 then
 					local new_mob_pos = floor_nodes[math.random(#floor_nodes)]
 					new_mob_pos.y = new_mob_pos.y + 2
@@ -223,12 +245,20 @@ minetest.register_globalstep(function(dtime)
 
 			-- ... from standing on or near hot objects.
 			local counts =  minetest_find_nodes_in_area(minp, maxp, hot_stuff)
+			if not (counts and type(counts) == 'table') then
+				return
+			end
+
 			if #counts > 1 then
 				player:set_hp(player:get_hp() - 1)
 			end
 
 			-- ... from standing on or near poison.
 			local counts =  minetest_find_nodes_in_area(minp, maxp, poison_stuff)
+			if not (counts and type(counts) == 'table') then
+				return
+			end
+
 			if #counts > 1 then
 				player:set_hp(player:get_hp() - 1)
 			end
@@ -236,6 +266,10 @@ minetest.register_globalstep(function(dtime)
 			-- ... from standing on or near cold objects (less often).
 			if dps_count % cold_delay == 0 then
 				counts =  minetest_find_nodes_in_area(minp, maxp, cold_stuff)
+				if not (counts and type(counts) == 'table') then
+					return
+				end
+
 				if #counts > 1 then
 					player:set_hp(player:get_hp() - 1)
 				end
@@ -254,6 +288,9 @@ minetest.register_globalstep(function(dtime)
 	end
 
 	last_dps_check = minetest.get_gametime()
+	if not (last_dps_check and type(last_dps_check) == 'number') then
+		last_dps_check = 0
+	end
 	dps_count = dps_count - 1
 end)
 
@@ -269,6 +306,10 @@ minetest.register_abm({
 	chance = 10,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		minetest.set_node(pos, {name = "default:cobble"})
 		minetest.sound_play("default_cool_lava",
 		{pos = pos, max_hear_distance = 16, gain = 0.25})
@@ -282,6 +323,10 @@ minetest.register_abm({
 	chance = 150,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		fun_caves.soft_boom(pos)
 	end
 })
@@ -294,6 +339,10 @@ minetest.register_abm({
 	chance = 50,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		fun_caves.soft_boom(pos)
 	end
 })
@@ -306,6 +355,10 @@ minetest.register_abm({
 	interval = fun_caves.time_factor,
 	chance = 25,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		-- Check for stem under the cap.
 		local node_under = minetest.get_node_or_nil({x = pos.x, y = pos.y - 1, z = pos.z})
 		if not node_under or node_under.name ~= "fun_caves:giant_mushroom_stem" then
@@ -321,6 +374,10 @@ minetest.register_abm({
 	interval = 2 * fun_caves.time_factor,
 	chance = 110,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		if (minetest.get_node_light(pos, nil) or 99) >= fun_caves.light_max + 2 then
 			minetest.remove_node(pos)
 			return
@@ -338,6 +395,10 @@ minetest.register_abm({
 	chance = 100,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		pos.y = pos.y - 1
 		local node_below = minetest.get_node_or_nil(pos)
 		if node_below and node_below.name == 'air' then
@@ -352,6 +413,10 @@ minetest.register_abm({
 	chance = 40,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		minetest.remove_node(pos)
 	end
 })
@@ -363,29 +428,14 @@ minetest.register_abm({
 	interval = fun_caves.time_factor,
 	chance = 10,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		minetest.set_node(pos, ice_node)
 	end
 })
 
-if false then
-minetest.register_abm({
-	nodenames = {"fun_caves:pyramid_1"},
-	interval = 1,
-	chance = 1,
-	action = function(pos, node)
-		local p = table.copy(pos)
-		for i = 1, 20 do
-			p.y = p.y + 1
-			local node = minetest.get_node_or_nil(p)
-			if not node or node.name ~= 'air' then
-				return
-			end
-		end
-		minetest.set_node(pos, {name = 'default:sandstone'})
-	end
-})
-end
-
 local no_tree_grow = {'fun_caves:bark', 'fun_caves:leaves'}
 local wood_nodes = {{name = 'fun_caves:diamondwood'}, {name = 'fun_caves:ironwood'}, {name = 'fun_caves:sap'}, {name = 'fun_caves:tree'}}
 minetest.register_abm({
@@ -394,6 +444,10 @@ minetest.register_abm({
 	chance = 900,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		local new_pos = minetest.find_node_near(pos, 1, no_tree_grow)
 		if new_pos then
 			return
@@ -425,6 +479,10 @@ minetest.register_abm({
 	interval = fun_caves.time_factor,
 	chance = 10,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		if pos.y <= 11168 or pos.y >= 15168 then
 			return
 		end
@@ -432,6 +490,10 @@ minetest.register_abm({
 		local p1 = vector.subtract(pos, 1)
 		local p2 = vector.add(pos, 1)
 		local positions =  minetest.find_nodes_in_area(p1, p2, air_list)
+		if not (positions and type(positions) == 'table') then
+			return
+		end
+
 		local minetest_get_node_or_nil = minetest.get_node_or_nil
 		local minetest_set_node = minetest.set_node
 		for _, p3 in pairs(positions) do
@@ -451,6 +513,10 @@ minetest.register_abm({
 	chance = 50,
 	catch_up = false,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		if (minetest.get_node_light(pos, nil) or 99) >= fun_caves.light_max + 2 then
 			minetest.remove_node(pos)
 			return
@@ -492,6 +558,10 @@ minetest.register_abm({
 	interval = 2 * fun_caves.time_factor,
 	chance = 75,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		local pos_up = {x=pos.x,y=pos.y+1,z=pos.z}
 		local node_up = minetest.get_node_or_nil(pos_up)
 		if not node_up or node_up.name ~= "air" then
@@ -515,6 +585,10 @@ minetest.register_abm({
 	interval = 2 * fun_caves.time_factor,
 	chance = 75,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		if pos.y > 0 then
 			return
 		end
@@ -539,6 +613,10 @@ minetest.register_abm({
 	interval = 5 * fun_caves.time_factor,
 	chance = 375,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		-- Clumsy, but it's the best way to limit them to caves.
 		if pos.y > 0 then
 			return
@@ -569,6 +647,10 @@ minetest.register_abm({
 	interval = 9 * fun_caves.time_factor,
 	chance = 1000,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		local pos_up = {x=pos.x,y=pos.y+1,z=pos.z}
 		local node_up = minetest.get_node_or_nil(pos_up)
 		if not node_up or node_up.name ~= "air" then
@@ -594,6 +676,10 @@ minetest.register_abm({
 	interval = 3 * fun_caves.time_factor,
 	chance = 300,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		if not fun_caves.hot_spike then
 			return
 		end
@@ -639,8 +725,16 @@ minetest.register_abm({
 	catch_up = false,
 	chance = 32767,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		local ps = {}
 		local players = minetest.get_connected_players()
+		if not (players and type(players) == 'table') then
+			return
+		end
+
 		for i = 1, #players do
 			local pp = players[i]:getpos()
 			local pd = vector.subtract(pp, pos)
@@ -669,6 +763,10 @@ minetest.register_abm({
 	interval = 3 * fun_caves.time_factor,
 	chance = 330,
 	action = function(pos, node)
+		if not (pos and node) then
+			return
+		end
+
 		minetest.set_node(pos, {name="default:dirt"})
 	end
 })
@@ -706,6 +804,10 @@ minetest.after(0, function()
 end)
 
 local function add_effects(pos, radius)
+	if not (pos and radius and type(radius) == 'number') then
+		return
+	end
+
 	minetest.add_particlespawner({
 		amount = 128,
 		time = 1,
@@ -724,6 +826,10 @@ local function add_effects(pos, radius)
 end
 
 local function destroy(pos, cid)
+	if not (pos and cid) then
+		return
+	end
+
 	local def = cid_data[cid]
 	if not def or minetest.is_protected(pos, "") then
 		return
@@ -744,6 +850,10 @@ local function destroy(pos, cid)
 end
 
 local function explode(pos, radius)
+	if not (pos and radius and type(radius) == 'number') then
+		return
+	end
+
 	local pos = vector.round(pos)
 	local vm = VoxelManip()
 	local p1 = vector.subtract(pos, radius)
@@ -778,6 +888,10 @@ local function explode(pos, radius)
 end
 
 local function calc_velocity(pos1, pos2, old_vel, power)
+	if not (pos1 and pos2 and old_vel and power) then
+		return
+	end
+
 	local vel = vector.direction(pos1, pos2)
 	vel = vector.normalize(vel)
 	vel = vector.multiply(vel, power)
@@ -793,9 +907,17 @@ local function calc_velocity(pos1, pos2, old_vel, power)
 end
 
 local function entity_physics(pos, radius)
+	if not (pos and radius and type(radius) == 'number') then
+		return
+	end
+
 	-- Make the damage radius larger than the destruction radius
 	radius = radius * 2
 	local objs = minetest.get_objects_inside_radius(pos, radius)
+	if not (objs and type(objs) == 'table') then
+		return
+	end
+
 	local math_max = math.max
 	local vector_distance = vector.distance
 	for _, obj in pairs(objs) do
diff --git a/init.lua b/init.lua
index fac24e0..e42f3db 100644
--- a/init.lua
+++ b/init.lua
@@ -227,11 +227,15 @@ function fun_caves.hunger_change(player, change)
 	end
 
 	local hp = player:get_hp()
+	if not (hp and type(hp) == 'number') then
+		return
+	end
+
 	if change < 0 or hp >= 16 then
 		fun_caves.db.hunger[player_name] = math.min(20, math.max(0, fun_caves.db.hunger[player_name] + change))
 		player:hud_change(fun_caves.hunger_id[player_name], 'number', fun_caves.db.hunger[player_name])
 		if fun_caves.db.hunger[player_name] == 0 then
-			player:set_hp(player:get_hp() - 1)
+			player:set_hp(hp - 1)
 		end
 	end
 end