improved compatibility with Excellent Enchants

Changelog.txt

@@ -5,10 +5,12 @@ Version 2.2.049
     Fixed copper items not giving XP for Repair (thanks Remski01)
     Fixed edge case where mcMMO could drop items with stack size set outside normal bounds
     Fixed a bug where tamed wolves could cause errors on Folia (thanks Warriorrrr)
+    Improved compatibility with Excellent Enchants (fixed error spam from Flame Walker)
 
     NOTES:
     As a semi-permanent work around, mcMMO keeps track of when players swing their weapon, if they have swung it recently enough combat skills will work even if you have a spear in your off-hand.
     Prior to this patch, mcMMO disabled combat abilities when spear was in off-hand to prevent the off-hand spear charge from applying combat abilities from other skills, as mcMMO was unable to determine which item (mainhand vs offhand) caused the damage from the event information alone.
+
 Version 2.2.048
     Fixed error when loading Spears skill manager on older Minecraft versions
     Fixed error when using /spears command on an older Minecraft version

src/main/java/com/gmail/nossr50/listeners/BlockListener.java

@@ -259,7 +259,7 @@ public class BlockListener implements Listener {
      */
     @EventHandler(priority = EventPriority.MONITOR, ignoreCancelled = true)
     public void onBlockFormEvent(BlockFormEvent event) {
-        World world = event.getBlock().getWorld();
+        final World world = event.getBlock().getWorld();
 
         /* WORLD BLACKLIST CHECK */
         if (WorldBlacklist.isWorldBlacklisted(world)) {
@@ -267,7 +267,11 @@ public class BlockListener implements Listener {
         }
 
         if (ExperienceConfig.getInstance().preventStoneLavaFarming()) {
-            BlockState newState = event.getNewState();
+            final BlockState newState = event.getNewState();
+            if (!newState.isPlaced()) {
+                // not backed by a real block
+                return;
+            }
 
             if (newState.getType() != Material.OBSIDIAN
                     && ExperienceConfig.getInstance().doesBlockGiveSkillXP(