nms-patches/TileEntityPiston.patch


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--- a/net/minecraft/server/TileEntityPiston.java
+++ b/net/minecraft/server/TileEntityPiston.java
@@ -133,6 +133,7 @@
     }
 
     public void E_() {
+        if (this.world == null) return; // CraftBukkit
         this.j = this.i;
         if (this.j >= 1.0F) {
             this.j();