diff --git a/lava_flan.lua b/lava_flan.lua
index 5926cc7..aa045c8 100644
--- a/lava_flan.lua
+++ b/lava_flan.lua
@@ -116,6 +116,9 @@ local old_handle_node_drops = minetest.handle_node_drops
 
 function minetest.handle_node_drops(pos, drops, digger)
 
+	-- does player exist?
+	if not digger then return end
+
 	-- are we holding Lava Pick?
 	if digger:get_wielded_item():get_name() ~= ("mobs:pick_lava") then
 		return old_handle_node_drops(pos, drops, digger)
diff --git a/sand_monster.lua b/sand_monster.lua
index 98e840f..27881cc 100644
--- a/sand_monster.lua
+++ b/sand_monster.lua
@@ -3,7 +3,8 @@ local S = mobs.intllib
 
 
 -- custom particle effects
-local effect = function(pos, amount, texture, min_size, max_size, radius, gravity, glow)
+local effect = function(
+		pos, amount, texture, min_size, max_size, radius, gravity, glow)
 
 	radius = radius or 2
 	min_size = min_size or 0.5
diff --git a/spider.lua b/spider.lua
index 3fa00a5..f587aab 100644
--- a/spider.lua
+++ b/spider.lua
@@ -5,6 +5,9 @@ local get_velocity = function(self)
 
 	local v = self.object:get_velocity()
 
+	-- sanity check
+	if not v then return 0 end
+
 	return (v.x * v.x + v.z * v.z) ^ 0.5
 end
 
@@ -120,6 +123,9 @@ mobs:register_mob("mobs_monster:spider", {
 		local pos = self.object:get_pos()
 		local yaw = self.object:get_yaw()
 
+		-- sanity check
+		if not yaw then return end
+
 		pos.y = pos.y + self.collisionbox[2] - 0.2
 
 		local dir_x = -math.sin(yaw) * (self.collisionbox[4] + 0.5)
@@ -160,7 +166,7 @@ mobs:spawn({
 	name = "mobs_monster:spider",
 	nodes = {
 		"default:dirt_with_rainforest_litter", "default:snowblock",
-		"default:snow", "ethereal:crystal_dirt"
+		"default:snow", "ethereal:crystal_dirt", "ethereal:cold_dirt"
 	},
 	min_light = 0,
 	max_light = 8,
diff --git a/textures/zmobs_lava_flan.png b/textures/zmobs_lava_flan.png
index d9799ae..23ab266 100644
Binary files a/textures/zmobs_lava_flan.png and b/textures/zmobs_lava_flan.png differ
diff --git a/textures/zmobs_lava_flan2.png b/textures/zmobs_lava_flan2.png
index d8bd632..093278c 100644
Binary files a/textures/zmobs_lava_flan2.png and b/textures/zmobs_lava_flan2.png differ
diff --git a/textures/zmobs_lava_flan3.png b/textures/zmobs_lava_flan3.png
index 9ecd196..08c2caf 100644
Binary files a/textures/zmobs_lava_flan3.png and b/textures/zmobs_lava_flan3.png differ