diff --git a/src/API/ServerAPI.php b/src/API/ServerAPI.php
index 17f093e7e..d2e0af2ab 100644
--- a/src/API/ServerAPI.php
+++ b/src/API/ServerAPI.php
@@ -133,7 +133,7 @@ class ServerAPI{
 					$last = $info["development"]["date"];
 					if($last >= $this->getProperty("last-update") and $this->getProperty("last-update") !== false){
 						console("[NOTICE] \x1b[33mA new DEVELOPMENT version of PocketMine-MP has been released");
-						console("[NOTICE] \x1b[33mA \"".$info["development"]["version"]."\" [".substr($info["development"]["commit"], 0, 10)."]");
+						console("[NOTICE] \x1b[33mVersion \"".$info["development"]["version"]."\" [".substr($info["development"]["commit"], 0, 10)."]");
 						console("[NOTICE] \x1b[36mIf you want to update, get the latest version at ".$info["development"]["download"]);
 						console("[NOTICE] This message will dissapear when you issue the command \"/update-done\"");
 						sleep(3);
diff --git a/src/classes/material/block/solid/Slab.php b/src/classes/material/block/solid/Slab.php
index 65469e2bd..ed5347170 100644
--- a/src/classes/material/block/solid/Slab.php
+++ b/src/classes/material/block/solid/Slab.php
@@ -71,6 +71,9 @@ class SlabBlock extends TransparentBlock{
 			}else{
 				return false;
 			}
+			if($block->getID() === SLAB and ($target->getMetadata() & 0x07) !== ($this->meta & 0x07)){
+				return false;
+			}
 			$level->setBlock($block, $this->id, $this->meta);
 			return true;
 		}