diff --git a/src/pocketmine/PocketMine.php b/src/pocketmine/PocketMine.php
index 1efdd0a32..735b529af 100644
--- a/src/pocketmine/PocketMine.php
+++ b/src/pocketmine/PocketMine.php
@@ -37,7 +37,7 @@ namespace pocketmine {
 	use pocketmine\wizard\SetupWizard;
 
 	const NAME = "PocketMine-MP";
-	const BASE_VERSION = "3.0.2";
+	const BASE_VERSION = "4.0.0";
 	const IS_DEVELOPMENT_BUILD = true;
 	const BUILD_NUMBER = 0;
 
diff --git a/src/pocketmine/block/SignPost.php b/src/pocketmine/block/SignPost.php
index a76676254..fdd4a0e1a 100644
--- a/src/pocketmine/block/SignPost.php
+++ b/src/pocketmine/block/SignPost.php
@@ -61,7 +61,7 @@ class SignPost extends Transparent{
 		if($face !== Vector3::SIDE_DOWN){
 
 			if($face === Vector3::SIDE_UP){
-				$this->meta = floor((($player->yaw + 180) * 16 / 360) + 0.5) & 0x0f;
+				$this->meta = $player !== null ? (floor((($player->yaw + 180) * 16 / 360) + 0.5) & 0x0f) : 0;
 				$this->getLevel()->setBlock($blockReplace, $this, true);
 			}else{
 				$this->meta = $face;