diff --git a/build.gradle b/build.gradle
index 9ea249e419..ffdbefc4bd 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@ allprojects {
         appName = 'Mindustry'
         gdxVersion = '1.9.8'
         roboVMVersion = '2.3.0'
-        uCoreVersion = 'c28462b127'
+        uCoreVersion = '1d353d76e9'
 
         getVersionString = {
             String buildVersion = getBuildVersion()
diff --git a/core/src/io/anuke/mindustry/entities/Unit.java b/core/src/io/anuke/mindustry/entities/Unit.java
index e234c4936a..71d1fe1dac 100644
--- a/core/src/io/anuke/mindustry/entities/Unit.java
+++ b/core/src/io/anuke/mindustry/entities/Unit.java
@@ -33,17 +33,11 @@ import static io.anuke.mindustry.Vars.state;
 import static io.anuke.mindustry.Vars.world;
 
 public abstract class Unit extends DestructibleEntity implements SaveTrait, TargetTrait, SyncTrait, DrawTrait, TeamTrait, CarriableTrait, InventoryTrait{
-    /**
-     * total duration of hit flash effect
-     */
+    /**Total duration of hit flash effect*/
     public static final float hitDuration = 9f;
-    /**
-     * Percision divisor of velocity, used when writing. For example a value of '2' would mean the percision is 1/2 = 0.5-size chunks.
-     */
+    /**Percision divisor of velocity, used when writing. For example a value of '2' would mean the percision is 1/2 = 0.5-size chunks.*/
     public static final float velocityPercision = 8f;
-    /**
-     * Maximum absolute value of a velocity vector component.
-     */
+    /**Maximum absolute value of a velocity vector component.*/
     public static final float maxAbsVelocity = 127f / velocityPercision;
 
     private static final Vector2 moveVector = new Vector2();
diff --git a/core/src/io/anuke/mindustry/entities/units/UnitDrops.java b/core/src/io/anuke/mindustry/entities/units/UnitDrops.java
index 2ba240de70..4ea154cae6 100644
--- a/core/src/io/anuke/mindustry/entities/units/UnitDrops.java
+++ b/core/src/io/anuke/mindustry/entities/units/UnitDrops.java
@@ -3,6 +3,7 @@ package io.anuke.mindustry.entities.units;
 import io.anuke.mindustry.Vars;
 import io.anuke.mindustry.content.Items;
 import io.anuke.mindustry.entities.effect.ItemDrop;
+import io.anuke.mindustry.game.Team;
 import io.anuke.mindustry.type.Item;
 import io.anuke.ucore.util.Mathf;
 
@@ -11,7 +12,7 @@ public class UnitDrops{
     private static Item[] dropTable;
 
     public static void dropItems(BaseUnit unit){
-        if(Vars.itemGroup.size() > maxItems){
+        if(Vars.itemGroup.size() > maxItems || unit.getTeam() != Team.red){
             return;
         }
 
diff --git a/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java b/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java
index 49e26841b2..1836b9dba8 100644
--- a/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java
+++ b/core/src/io/anuke/mindustry/world/blocks/BuildBlock.java
@@ -217,6 +217,9 @@ public class BuildBlock extends Block{
 
             if(recipe != null){
                 ItemStack[] requirements = recipe.requirements;
+                if(requirements.length != accumulator.length || totalAccumulator.length != requirements.length){
+                    setDeconstruct(previous);
+                }
 
                 for(int i = 0; i < requirements.length; i++){
                     accumulator[i] += Math.min(requirements[i].amount * amount / 2f, requirements[i].amount/2f - totalAccumulator[i]); //add scaled amount progressed to the accumulator
diff --git a/core/src/io/anuke/mindustry/world/blocks/power/PowerNode.java b/core/src/io/anuke/mindustry/world/blocks/power/PowerNode.java
index 3759f48182..c1eca5d14d 100644
--- a/core/src/io/anuke/mindustry/world/blocks/power/PowerNode.java
+++ b/core/src/io/anuke/mindustry/world/blocks/power/PowerNode.java
@@ -227,7 +227,7 @@ public class PowerNode extends PowerBlock{
     }
 
     protected boolean shouldDistribute(Tile tile, Tile other){
-        return other != null && other.getTeamID() == tile.getTeamID() && other.entity.power.amount / other.block().powerCapacity <= tile.entity.power.amount / powerCapacity &&
+        return other != null && other.entity != null && other.block().hasPower && other.getTeamID() == tile.getTeamID() && other.entity.power.amount / other.block().powerCapacity <= tile.entity.power.amount / powerCapacity &&
                 !(other.block() instanceof PowerGenerator); //do not distribute to power generators
     }