use remove_node instead of dig_node to fix a crash

technic/machines/HV/nuclear_reactor.lua

@@ -683,7 +683,7 @@ minetest.register_abm({
 	neighbors = {"technic:corium_source"},
 	interval = 1,
 	chance = 1,
-	action = function (pos, node)
+	action = function(pos)
 		minetest.remove_node(pos)
 	end,
 })
@@ -693,7 +693,7 @@ minetest.register_abm({
 	neighbors = {"group:water"},
 	interval = 1,
 	chance = 1,
-	action = function (pos, node)
+	action = function(pos)
 		minetest.set_node(pos, {name="technic:chernobylite_block"})
 	end,
 })
@@ -704,28 +704,35 @@ minetest.register_abm({
 	nodenames = {"technic:corium_flowing"},
 	interval = 5,
 	chance = (griefing and 10 or 1),
-	action = function (pos, node)
+	action = function (pos)
 		minetest.set_node(pos, {name="technic:chernobylite_block"})
 	end,
 })
 
-if griefing then
+if not griefing then
-	minetest.register_abm({
+	return
-		nodenames = { "technic:corium_source", "technic:corium_flowing" },
+end
-		interval = 4,
+
-		chance = 4,
+local offsets = {
-		action = function (pos, node)
+	vector.new(1,0,0),
-			for _, offset in ipairs({
+	vector.new(-1,0,0),
-				vector.new(1,0,0),
+	vector.new(0,0,1),
-				vector.new(-1,0,0),
+	vector.new(0,0,-1),
-				vector.new(0,0,1),
+	vector.new(0,-1,0),
-				vector.new(0,0,-1),
+}
-				vector.new(0,-1,0),
+
-			}) do
+minetest.register_abm({
-				if math.random(8) == 1 then
+	nodenames = {"technic:corium_source", "technic:corium_flowing"},
-					minetest.dig_node(vector.add(pos, offset))
+	interval = 4,
+	chance = 4,
+	action = function(pos)
+		for _,offset in pairs(offsets) do
+			if math.random(8) == 1 then
+				local pos = vector.add(pos, offset)
+				if minetest.get_node(pos).name ~= "air" then
+					minetest.remove_node(pos)
 				end
 			end
-		end,
+		end
-	})
+	end,
-end
+})