Check if the stairs are upside down or under something

pom.xml

@@ -3,7 +3,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>maru</groupId>
 	<artifactId>PmChair</artifactId>
-	<version>2.0.3</version>
+	<version>2.0.4</version>
 	<properties>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>

src/main/java/maru/PmChair.java

@@ -70,6 +70,8 @@ public void onTouch(PlayerInteractEvent event) {
 
         if (!this.onChair.containsKey(name)) {
             if (block instanceof BlockStairs) {
+                if ((block.getDamage() & 4) != 0 || block.up().isSolid()) return;
+
                 if (!this.doubleTap.containsKey(name)) {
                     this.doubleTap.put(name, System.currentTimeMillis());
                     player.sendPopup(TextFormat.RED + this.get("touch-popup"));