PaperMC/paper-server/patches/sources/net/minecraft/world/item/BoneMealItem.java.patch

--- a/net/minecraft/world/item/BoneMealItem.java
+++ b/net/minecraft/world/item/BoneMealItem.java
@@ -35,24 +35,30 @@
 
     @Override
     public InteractionResult useOn(UseOnContext context) {
-        Level world = context.getLevel();
-        BlockPos blockposition = context.getClickedPos();
-        BlockPos blockposition1 = blockposition.relative(context.getClickedFace());
+        // CraftBukkit start - extract bonemeal application logic to separate, static method
+        return BoneMealItem.applyBonemeal(context);
+    }
 
-        if (BoneMealItem.growCrop(context.getItemInHand(), world, blockposition)) {
+    public static InteractionResult applyBonemeal(UseOnContext itemactioncontext) {
+        // CraftBukkit end
+        Level world = itemactioncontext.getLevel();
+        BlockPos blockposition = itemactioncontext.getClickedPos();
+        BlockPos blockposition1 = blockposition.relative(itemactioncontext.getClickedFace());
+
+        if (BoneMealItem.growCrop(itemactioncontext.getItemInHand(), world, blockposition)) {
             if (!world.isClientSide) {
-                context.getPlayer().gameEvent(GameEvent.ITEM_INTERACT_FINISH);
+                if (itemactioncontext.getPlayer() != null) itemactioncontext.getPlayer().gameEvent(GameEvent.ITEM_INTERACT_FINISH); // CraftBukkit - SPIGOT-7518
                 world.levelEvent(1505, blockposition, 15);
             }
 
             return InteractionResult.SUCCESS;
         } else {
             BlockState iblockdata = world.getBlockState(blockposition);
-            boolean flag = iblockdata.isFaceSturdy(world, blockposition, context.getClickedFace());
+            boolean flag = iblockdata.isFaceSturdy(world, blockposition, itemactioncontext.getClickedFace());
 
-            if (flag && BoneMealItem.growWaterPlant(context.getItemInHand(), world, blockposition1, context.getClickedFace())) {
+            if (flag && BoneMealItem.growWaterPlant(itemactioncontext.getItemInHand(), world, blockposition1, itemactioncontext.getClickedFace())) {
                 if (!world.isClientSide) {
-                    context.getPlayer().gameEvent(GameEvent.ITEM_INTERACT_FINISH);
+                    if (itemactioncontext.getPlayer() != null) itemactioncontext.getPlayer().gameEvent(GameEvent.ITEM_INTERACT_FINISH); // CraftBukkit - SPIGOT-7518
                     world.levelEvent(1505, blockposition1, 15);
                 }