diff --git a/basic_machines/quarry.lua b/basic_machines/quarry.lua
index 33be5ec..94f863f 100644
--- a/basic_machines/quarry.lua
+++ b/basic_machines/quarry.lua
@@ -26,7 +26,7 @@ local CRD = function(pos) return (minetest.registered_nodes[techage.get_node_lvm
 
 local S = techage.S
 
-local CYCLE_TIME = 3
+local CYCLE_TIME = 4
 local STANDBY_TICKS = 4
 local COUNTDOWN_TICKS = 4
 
diff --git a/basis/nodedata_sqlite.lua b/basis/nodedata_sqlite.lua
index dcc9cfa..8540365 100644
--- a/basis/nodedata_sqlite.lua
+++ b/basis/nodedata_sqlite.lua
@@ -72,8 +72,11 @@ end
 local api = {}
 
 function api.store_mapblock_data(key, mapblock_data)
-	if use_marshal then
-		set_block(key, marshal.encode(mapblock_data))
+	if use_marshal and mapblock_data then
+		local data = marshal.encode(mapblock_data)
+		if data then
+			set_block(key, data)
+		end
 	else
 		set_block(key, minetest.serialize(mapblock_data))
 	end
diff --git a/items/cracking.lua b/items/cracking.lua
index 284bda4..52c98f3 100644
--- a/items/cracking.lua
+++ b/items/cracking.lua
@@ -10,7 +10,8 @@
 
 	Cracking breaks long chains of hydrocarbons into short chains using a catalyst.
 	Gibbsite powder serves as a catalyst (is not consumed).
-	It can be used to convert bitumen into fueloil, fueloil into naphtha and naphtha into gasoline.
+	It can be used to convert bitumen into fueloil, fueloil into naphtha, naphtha into gasoline,
+	and gasoline into gas.
 
 	In hydrogenation, pairs of hydrogen atoms are added to a molecule to convert short-chain
 	hydrocarbons into long ones.
@@ -45,6 +46,22 @@ techage.recipes.add("ta4_doser", {
 	catalyst = "techage:gibbsite_powder",
 })
 
+techage.recipes.add("ta4_doser", {
+	output = "techage:isobutane 1",
+	input = {
+		"techage:gasoline 1",
+	},
+	catalyst = "techage:gibbsite_powder",
+})
+
+techage.recipes.add("ta4_doser", {
+	output = "techage:gas 1",
+	input = {
+		"techage:isobutane 1",
+	},
+	catalyst = "techage:gibbsite_powder",
+})
+
 -- Hydrogenate
 techage.recipes.add("ta4_doser", {
 	output = "techage:isobutane 1",