diff --git a/api-modules/FactionsM/pom.xml b/api-modules/FactionsM/pom.xml
index 8032fe1..8f62a96 100644
--- a/api-modules/FactionsM/pom.xml
+++ b/api-modules/FactionsM/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>EpicBosses</artifactId>
         <groupId>com.songoda.epicbosses</groupId>
-        <version>1.2.10</version>
+        <version>1.2.11</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/api-modules/FactionsOne/pom.xml b/api-modules/FactionsOne/pom.xml
index 205a7df..3abd6a1 100644
--- a/api-modules/FactionsOne/pom.xml
+++ b/api-modules/FactionsOne/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>EpicBosses</artifactId>
         <groupId>com.songoda.epicbosses</groupId>
-        <version>1.2.10</version>
+        <version>1.2.11</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/api-modules/FactionsUUID/pom.xml b/api-modules/FactionsUUID/pom.xml
index ab2d452..1188259 100644
--- a/api-modules/FactionsUUID/pom.xml
+++ b/api-modules/FactionsUUID/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>EpicBosses</artifactId>
         <groupId>com.songoda.epicbosses</groupId>
-        <version>1.2.10</version>
+        <version>1.2.11</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/api-modules/LegacyFactions/pom.xml b/api-modules/LegacyFactions/pom.xml
index 1b25276..c97b28b 100644
--- a/api-modules/LegacyFactions/pom.xml
+++ b/api-modules/LegacyFactions/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>EpicBosses</artifactId>
         <groupId>com.songoda.epicbosses</groupId>
-        <version>1.2.10</version>
+        <version>1.2.11</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/plugin-modules/Core/pom.xml b/plugin-modules/Core/pom.xml
index 5a8dfa9..daa5ae8 100644
--- a/plugin-modules/Core/pom.xml
+++ b/plugin-modules/Core/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>EpicBosses</artifactId>
         <groupId>com.songoda.epicbosses</groupId>
-        <version>1.2.10</version>
+        <version>1.2.11</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/plugin-modules/Core/src/com/songoda/epicbosses/holder/ActiveMinionHolder.java b/plugin-modules/Core/src/com/songoda/epicbosses/holder/ActiveMinionHolder.java
index 0468391..4b904ff 100644
--- a/plugin-modules/Core/src/com/songoda/epicbosses/holder/ActiveMinionHolder.java
+++ b/plugin-modules/Core/src/com/songoda/epicbosses/holder/ActiveMinionHolder.java
@@ -8,6 +8,7 @@ import org.bukkit.entity.LivingEntity;
 
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.UUID;
 import java.util.stream.Collectors;
 import org.bukkit.entity.Entity;
@@ -72,16 +73,16 @@ public class ActiveMinionHolder implements IActiveHolder {
 //        this.livingEntityMap.clear();
 
         // grab list of all valid entities by UUID that can be removed
-        Map<Integer, Entity> toRemove = this.livingEntityMap.entrySet().stream()
-                .collect(Collectors.toMap(e -> e.getKey(), e -> ServerUtils.get().getEntity(e.getValue())))
+        Map<Integer, Entity> toRemove = this.livingEntityMap.entrySet().stream().filter(Objects::nonNull)
+                .collect(Collectors.toMap(Map.Entry::getKey, e -> ServerUtils.get().getEntity(e.getValue())))
                 .entrySet().stream()
                 .filter(e -> e.getValue() != null && e.getValue().getWorld().isChunkLoaded(
                                 e.getValue().getLocation().getBlockX() >> 4,
                                 e.getValue().getLocation().getBlockZ() >> 4))
-                .collect(Collectors.toMap(e -> e.getKey(), e -> e.getValue()));
+                .collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
 
         // remove everything we can
-        toRemove.entrySet().stream().forEach(e -> {
+        toRemove.entrySet().forEach(e -> {
             e.getValue().remove();
             livingEntityMap.remove(e.getKey());
         });
diff --git a/plugin-modules/Core/src/com/songoda/epicbosses/listeners/during/BossDamageListener.java b/plugin-modules/Core/src/com/songoda/epicbosses/listeners/during/BossDamageListener.java
index 61e8df6..c476dd8 100644
--- a/plugin-modules/Core/src/com/songoda/epicbosses/listeners/during/BossDamageListener.java
+++ b/plugin-modules/Core/src/com/songoda/epicbosses/listeners/during/BossDamageListener.java
@@ -81,7 +81,7 @@ public class BossDamageListener implements Listener {
             player = (Player) shooter;
         }
 
-        if (player == null) return;
+        if (player == null || activeBossHolder == null) return;
 
         double currentDamage = activeBossHolder.getMapOfDamagingUsers().getOrDefault(player.getUniqueId(), 0.0);
         BossDamageEvent bossDamageEvent = new BossDamageEvent(activeBossHolder, livingEntity, livingEntity.getEyeLocation(), damage);
diff --git a/plugin-modules/Core/src/com/songoda/epicbosses/utils/itemstack/ItemStackHolderConverter.java b/plugin-modules/Core/src/com/songoda/epicbosses/utils/itemstack/ItemStackHolderConverter.java
index ab8d495..39cc816 100644
--- a/plugin-modules/Core/src/com/songoda/epicbosses/utils/itemstack/ItemStackHolderConverter.java
+++ b/plugin-modules/Core/src/com/songoda/epicbosses/utils/itemstack/ItemStackHolderConverter.java
@@ -4,7 +4,6 @@ import com.songoda.core.compatibility.CompatibleMaterial;
 import com.songoda.epicbosses.utils.IConverter;
 import com.songoda.epicbosses.utils.exceptions.NotImplementedException;
 import com.songoda.epicbosses.utils.itemstack.holder.ItemStackHolder;
-import org.bukkit.Material;
 import org.bukkit.configuration.ConfigurationSection;
 
 import java.util.List;
@@ -24,7 +23,11 @@ public class ItemStackHolderConverter implements IConverter<ItemStackHolder, Con
         Integer amount = (Integer) configurationSection.get("amount", null);
         CompatibleMaterial material = CompatibleMaterial.getMaterial(configurationSection.getString("type", null));
 
-        String type = material.getMaterial() == null ? "STONE" : material.getMaterial().name();
+        String type;
+        if (material == null)
+            type = "STONE";
+        else
+            type = material.getMaterial() == null ? "STONE" : material.getMaterial().name();
 
         Short durability = (Short) configurationSection.get("durability", null);
         if (material.getData() != -1) durability = (short) material.getData();
diff --git a/plugin-modules/FactionHelper/pom.xml b/plugin-modules/FactionHelper/pom.xml
index 1369b66..6f2fa60 100644
--- a/plugin-modules/FactionHelper/pom.xml
+++ b/plugin-modules/FactionHelper/pom.xml
@@ -5,7 +5,7 @@
     <parent>
         <artifactId>EpicBosses</artifactId>
         <groupId>com.songoda.epicbosses</groupId>
-        <version>1.2.10</version>
+        <version>1.2.11</version>
         <relativePath>../../pom.xml</relativePath>
     </parent>
     <modelVersion>4.0.0</modelVersion>
diff --git a/pom.xml b/pom.xml
index 5a141d7..c82b286 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
     <groupId>com.songoda.epicbosses</groupId>
     <artifactId>EpicBosses</artifactId>
     <packaging>pom</packaging>
-    <version>1.2.10</version>
+    <version>1.2.11</version>
 
     <modules>
         <module>api-modules/FactionsM</module>
@@ -16,7 +16,7 @@
     </modules>
 
     <properties>
-        <plugin.version>1.2.10</plugin.version>
+        <plugin.version>1.2.11</plugin.version>
         <plugin.name>EpicBosses</plugin.name>
         <plugin.main>com.songoda.epicbosses.EpicBosses</plugin.main>
         <plugin.author>Songoda</plugin.author>