Fixed an incredibly rare and difficult to perform dupe bug

Changelog.txt

@@ -1,3 +1,6 @@
+Version 2.1.57
+    Fixed an incredibly rare dupe bug that only happened with VERY specific config options that was extremely difficult to pull off
+
 Version 2.1.56
     Very large update to the zh_CN Chinese language file (thanks Dream_m)
 

pom.xml

@@ -2,7 +2,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>com.gmail.nossr50.mcMMO</groupId>
     <artifactId>mcMMO</artifactId>
-    <version>2.1.56</version>
+    <version>2.1.57</version>
     <name>mcMMO</name>
     <url>https://github.com/mcMMO-Dev/mcMMO</url>
     <scm>

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

@@ -29,10 +29,7 @@ import com.gmail.nossr50.util.sounds.SoundManager;
 import com.gmail.nossr50.util.sounds.SoundType;
 import com.gmail.nossr50.worldguard.WorldGuardManager;
 import com.gmail.nossr50.worldguard.WorldGuardUtils;
-import org.bukkit.GameMode;
-import org.bukkit.Location;
-import org.bukkit.Material;
-import org.bukkit.Tag;
+import org.bukkit.*;
 import org.bukkit.block.*;
 import org.bukkit.entity.Item;
 import org.bukkit.entity.Player;

src/main/java/com/gmail/nossr50/skills/mining/MiningManager.java

@@ -79,9 +79,8 @@ public class MiningManager extends SkillManager {
             SkillUtils.handleDurabilityChange(getPlayer().getInventory().getItemInMainHand(), Config.getInstance().getAbilityToolDamage());
         }
 
-        if ((mcMMO.getModManager().isCustomMiningBlock(blockState) && !mcMMO.getModManager().getBlock(blockState).isDoubleDropEnabled())) {
+        if(!Config.getInstance().getDoubleDropsEnabled(PrimarySkillType.MINING, blockState.getType()))
             return;
-        }
 
         boolean silkTouch = player.getInventory().getItemInMainHand().containsEnchantment(Enchantment.SILK_TOUCH);