diff --git a/src/constants/GeneralConstants.php b/src/constants/GeneralConstants.php
index 6bbb93952..d6d609b4e 100644
--- a/src/constants/GeneralConstants.php
+++ b/src/constants/GeneralConstants.php
@@ -37,6 +37,8 @@ define("VIEWER", 3);
 
 
 //Players
+define("PLAYER_MAX_RECOVERY_BUFFER", 1024);
+
 define("PLAYER_SURVIVAL_SLOTS", 36);
 define("PLAYER_CREATIVE_SLOTS", 111);
 
diff --git a/src/material/block/attachable/SignPost.php b/src/material/block/attachable/SignPost.php
index db03c4f7b..41edf3eef 100644
--- a/src/material/block/attachable/SignPost.php
+++ b/src/material/block/attachable/SignPost.php
@@ -55,7 +55,7 @@ class SignPostBlock extends TransparentBlock{
 	
 	public function onUpdate($type){
 		if($type === BLOCK_UPDATE_NORMAL){
-			if($this->getSide(0)->isSolid === false){ //Replace wit common break method
+			if($this->getSide(0)->getID() === AIR){ //Replace wit common break method
 				ServerAPI::request()->api->entity->drop($this, BlockAPI::getItem(SIGN, 0, 1));
 				$this->level->setBlock($this, new AirBlock(), false);
 				return BLOCK_UPDATE_NORMAL;