diff --git a/src/main/java/com/sosnitzka/taiga/blocks/BlockLignite.java b/src/main/java/com/sosnitzka/taiga/blocks/BlockLignite.java
index dd55df1..335de0b 100644
--- a/src/main/java/com/sosnitzka/taiga/blocks/BlockLignite.java
+++ b/src/main/java/com/sosnitzka/taiga/blocks/BlockLignite.java
@@ -9,6 +9,7 @@ import net.minecraft.util.math.MathHelper;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 
+import javax.annotation.ParametersAreNonnullByDefault;
 import java.util.Random;
 
 import static com.sosnitzka.taiga.Items.lignite;
@@ -29,6 +30,7 @@ public class BlockLignite extends BasicBlock {
     }
 
     @Override
+    @ParametersAreNonnullByDefault
     public int quantityDropped(IBlockState state, int fortune, Random random) {
         return MathHelper.getRandomIntegerInRange(random, 1, 3 + fortune);
     }
diff --git a/src/main/java/com/sosnitzka/taiga/blocks/BlockTiberium.java b/src/main/java/com/sosnitzka/taiga/blocks/BlockTiberium.java
index cd90357..977e65a 100644
--- a/src/main/java/com/sosnitzka/taiga/blocks/BlockTiberium.java
+++ b/src/main/java/com/sosnitzka/taiga/blocks/BlockTiberium.java
@@ -11,6 +11,7 @@ import net.minecraft.world.Explosion;
 import net.minecraft.world.IBlockAccess;
 import net.minecraft.world.World;
 
+import javax.annotation.ParametersAreNonnullByDefault;
 import java.util.Random;
 
 import static com.sosnitzka.taiga.util.Utils.PREFIX_ORE;
@@ -25,13 +26,13 @@ public class BlockTiberium extends BasicBlock {
 
     @Override
     public int getExpDrop(IBlockState state, IBlockAccess world, BlockPos pos, int fortune) {
-        Random rand = world instanceof World ? ((World) world).rand : new Random();
         if (random.nextBoolean()) {
             return random.nextInt(10) + fortune;
         } else return 0;
     }
 
     @Override
+    @ParametersAreNonnullByDefault
     public int quantityDropped(IBlockState state, int fortune, Random random) {
         return (random.nextInt(3 + fortune) + 1);
     }
diff --git a/src/main/java/com/sosnitzka/taiga/traits/TraitFragile.java b/src/main/java/com/sosnitzka/taiga/traits/TraitFragile.java
index aab740e..cb536f9 100644
--- a/src/main/java/com/sosnitzka/taiga/traits/TraitFragile.java
+++ b/src/main/java/com/sosnitzka/taiga/traits/TraitFragile.java
@@ -40,7 +40,6 @@ public class TraitFragile extends AbstractTrait {
                     if (r == 1) y += d;
                     if (r == 2) z += d;
                     BlockPos nextBlock = new BlockPos(x, y, z);
-                    int tn = (int) world.getWorldTime() + 5;
                     if (world.getBlockState(nextBlock) == world.getBlockState(pos)) {
                         Block block = Blocks.STONE;
                         int ib = random.nextInt(3);
diff --git a/src/main/java/com/sosnitzka/taiga/traits/TraitGarishly.java b/src/main/java/com/sosnitzka/taiga/traits/TraitGarishly.java
index b6f1eca..29ad56a 100644
--- a/src/main/java/com/sosnitzka/taiga/traits/TraitGarishly.java
+++ b/src/main/java/com/sosnitzka/taiga/traits/TraitGarishly.java
@@ -57,6 +57,7 @@ public class TraitGarishly extends AbstractTrait {
                         break;
                 }
 
+                assert i != null;
                 event.getDrops().add(0, new EntityItem(w, event.getEntity().posX, event.getEntity().posY, event.getEntity().posZ, i));
             }
         }