diff --git a/cow.lua b/cow.lua
index ec44b90..0728e38 100644
--- a/cow.lua
+++ b/cow.lua
@@ -63,7 +63,7 @@ mobs:register_mob("mobs_animal:cow", {
 		if mobs:feed_tame(self, clicker, 8, true, true) then
 
 			-- if fed 7x wheat or grass then cow can be milked again
-			if self.food > 6 then
+			if self.food and self.food > 6 then
 				self.gotten = false
 			end
 
diff --git a/sheep.lua b/sheep.lua
index d15d68f..38efac0 100644
--- a/sheep.lua
+++ b/sheep.lua
@@ -95,7 +95,7 @@ stepheight = 0.6,
 			if mobs:feed_tame(self, clicker, 8, true, true) then
 
 				--if fed 7x grass or wheat then sheep regrows wool
-				if self.food > 6 then
+				if self.food and self.food > 6 then
 
 					self.gotten = false