diff --git a/mods/mobs/api.lua b/mods/mobs/api.lua
index b24bcb31..03ef7394 100755
--- a/mods/mobs/api.lua
+++ b/mods/mobs/api.lua
@@ -506,7 +506,7 @@ function mobs:register_mob(name, def)
 				else
 					self.set_velocity(self, 0)
 					self.timer = self.timer + dtime
-					self.blinktimer = (self.blinktimer + dtime) or nil
+					self.blinktimer = (self.blinktimer or 0) + dtime
 						if self.blinktimer > 0.2 then
 							self.blinktimer = self.blinktimer - 0.2
 							if self.blinkstatus then
@@ -521,7 +521,7 @@ function mobs:register_mob(name, def)
 							pos.x = math.floor(pos.x+0.5)
 							pos.y = math.floor(pos.y+0.5)
 							pos.z = math.floor(pos.z+0.5)
-							do_tnt_physics(pos, 3)
+							--do_tnt_physics(pos, 3)
 							local meta = minetest.get_meta(pos)
 							minetest.sound_play("tnt_explode", {pos = pos,gain = 1.0,max_hear_distance = 16,})
 							if minetest.get_node(pos).name == "default:water_source" or minetest.get_node(pos).name == "default:water_flowing" or minetest.is_protected(pos, "tnt") then
@@ -535,7 +535,7 @@ function mobs:register_mob(name, def)
 											local np={x=pos.x+x,y=pos.y+y,z=pos.z+z}
 											local n = minetest.get_node(np)
 											if n.name ~= "air" and n.name ~= "default:obsidian" and n.name ~= "default:bedrock" and n.name ~= "protector:protect" then
-												activate_if_tnt(n.name, np, pos, 3)
+												--activate_if_tnt(n.name, np, pos, 3)
 												minetest.remove_node(np)
 												nodeupdate(np)
 												if n.name ~= "tnt:tnt" and math.random() > 0.9 then