diff --git a/resources/changelog/1.19.2-2.1.3.txt b/resources/changelog/1.19.2-2.1.3.txt
new file mode 100644
index 00000000..0b4c1b1a
--- /dev/null
+++ b/resources/changelog/1.19.2-2.1.3.txt
@@ -0,0 +1,6 @@
+As always, don't forget to backup your world before updating!
+Requires CyclopsCore version 1.17.0 or higher.
+
+Fixes:
+* Fix crash when IC2 is installed, Closes #254
+
diff --git a/resources/changelog/1.19.2-2.1.4.txt b/resources/changelog/1.19.2-2.1.4.txt
new file mode 100644
index 00000000..8b888a4c
--- /dev/null
+++ b/resources/changelog/1.19.2-2.1.4.txt
@@ -0,0 +1,6 @@
+As always, don't forget to backup your world before updating!
+Requires CyclopsCore version 1.17.0 or higher.
+
+Fixes:
+* Fix step assist stacking on world rejoin, Closes #255
+
diff --git a/resources/changelog/1.20.1-2.0.13.txt b/resources/changelog/1.20.1-2.0.13.txt
new file mode 100644
index 00000000..91f18feb
--- /dev/null
+++ b/resources/changelog/1.20.1-2.0.13.txt
@@ -0,0 +1,6 @@
+As always, don't forget to backup your world before updating!
+Requires CyclopsCore version 1.18.4 or higher.
+
+Fixes:
+* Fix crash when IC2 is installed, Closes #254
+
diff --git a/resources/changelog/1.20.1-2.0.14.txt b/resources/changelog/1.20.1-2.0.14.txt
new file mode 100644
index 00000000..dba15ba1
--- /dev/null
+++ b/resources/changelog/1.20.1-2.0.14.txt
@@ -0,0 +1,6 @@
+As always, don't forget to backup your world before updating!
+Requires CyclopsCore version 1.18.4 or higher.
+
+Fixes:
+* Fix step assist stacking on world rejoin, Closes #255
+
diff --git a/src/main/java/org/cyclops/everlastingabilities/ability/AbilityTypeSpecialStepAssist.java b/src/main/java/org/cyclops/everlastingabilities/ability/AbilityTypeSpecialStepAssist.java
index eda697ee..1a6ad3f4 100644
--- a/src/main/java/org/cyclops/everlastingabilities/ability/AbilityTypeSpecialStepAssist.java
+++ b/src/main/java/org/cyclops/everlastingabilities/ability/AbilityTypeSpecialStepAssist.java
@@ -38,6 +38,20 @@ public Codec<? extends IAbilityType> codec() {
         return Objects.requireNonNull(RegistryEntries.ABILITYSERIALIZER_SPECIAL_STEP_ASSIST.get());
     }
 
+    @Override
+    public void onTick(Player player, int level) {
+        super.onTick(player, level);
+
+        // On world re-join, ensure the modifier is in place.
+        AttributeInstance attribute = player.getAttribute(NeoForgeMod.STEP_HEIGHT.value());
+        if (attribute != null) {
+            AttributeModifier modifier = this.attributeModifiers.get(level);
+            if (!attribute.hasModifier(modifier)) {
+                attribute.addTransientModifier(modifier);
+            }
+        }
+    }
+
     @Override
     public void onChangedLevel(Player player, int oldLevel, int newLevel) {
         AttributeInstance attribute = player.getAttribute(NeoForgeMod.STEP_HEIGHT.value());
@@ -46,7 +60,7 @@ public void onChangedLevel(Player player, int oldLevel, int newLevel) {
                 attribute.removeModifier(this.attributeModifiers.get(oldLevel).getId());
             }
             if (newLevel > 0) {
-                attribute.addPermanentModifier(this.attributeModifiers.get(newLevel));
+                attribute.addTransientModifier(this.attributeModifiers.get(newLevel));
             }
         }
     }
diff --git a/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpers.java b/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpers.java
index 4596bd49..10808e8f 100644
--- a/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpers.java
+++ b/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpers.java
@@ -4,6 +4,8 @@
 import net.neoforged.fml.DistExecutor;
 import net.neoforged.neoforge.server.ServerLifecycleHooks;
 
+import javax.annotation.Nullable;
+
 /**
  * Helpers for world related logic.
  * TODO: use CyclopsCore's version in >1.19.2
@@ -15,6 +17,7 @@ public class WorldHelpers {
     /**
      * @return The registry access client-side server-side.
      */
+    @Nullable
     public static RegistryAccess getRegistryAccess() {
         if (ServerLifecycleHooks.getCurrentServer() != null) {
             return ServerLifecycleHooks.getCurrentServer().registryAccess();
diff --git a/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpersClient.java b/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpersClient.java
index 16841694..04f2914c 100644
--- a/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpersClient.java
+++ b/src/main/java/org/cyclops/everlastingabilities/core/helper/WorldHelpersClient.java
@@ -5,13 +5,19 @@
 import net.neoforged.api.distmarker.Dist;
 import net.neoforged.api.distmarker.OnlyIn;
 
+import javax.annotation.Nullable;
+
 /**
  * @author rubensworks
  */
 public class WorldHelpersClient {
 
     @OnlyIn(Dist.CLIENT)
+    @Nullable
     public static RegistryAccess getRegistryAccess() {
+        if (Minecraft.getInstance().level == null) {
+            return null;
+        }
         return Minecraft.getInstance().level.registryAccess();
     }