add additional nil checks for servers with luajit issues

init.lua

@@ -265,14 +265,18 @@ local function check_soil(pos, nodename, strength)
 		pos2.y = pos2.y + 1
 
 		if math.random(1, 5) == 5 then
+			if decor and #decor > 0 then
 				-- place random decoration (rare)
 				local dnum = #decor or 1
 				nod = decor[math.random(1, dnum)] or ""
+			end
 		else
+			if grass and #grass > 0 then
 				-- place random grass (common)
 				local dgra = #grass or 1
 				nod = #grass > 0 and grass[math.random(1, dgra)] or ""
 			end
+		end
 
 		if nod and nod ~= "" then
 			def = minetest.registered_nodes[nod]