diff --git a/api.lua b/api.lua
index e7d0147..b51d27e 100644
--- a/api.lua
+++ b/api.lua
@@ -461,7 +461,8 @@ function creatura.basic_punch_func(self, puncher, tflp, tool_caps, dir)
 		local dist = vec_dist(self.object:get_pos(), puncher:get_pos())
 		dir.y = 0.2
 		if self.touching_ground then
-			self:apply_knockback(dir, (damage / dist) * 8)
+			local power = clamp((damage / dist) * 8, 0, 8)
+			self:apply_knockback(dir, power)
 		end
 		self:hurt(damage)
 	end
diff --git a/mob_meta.lua b/mob_meta.lua
index 44a2fa2..edff7d1 100644
--- a/mob_meta.lua
+++ b/mob_meta.lua
@@ -741,10 +741,15 @@ function mob:activate(staticdata, dtime)
 	end
 
 	-- Staticdata
-	if staticdata then
-		local data = minetest.deserialize(staticdata)
-		if data then
-			for k, v in pairs(data) do
+	local data = minetest.deserialize(staticdata)
+
+	if data then
+		local tp
+		for k, v in pairs(data) do
+			tp = type(v)
+			if tp ~= "function"
+			and tp ~= "nil"
+			and tp ~= "userdata" then
 				self[k] = v
 			end
 		end