diff --git a/src/main/kotlin/com/bibireden/data_attributes/api/attribute/AttributeFormat.kt b/src/main/kotlin/com/bibireden/data_attributes/api/attribute/AttributeFormat.kt
index 5890256..106c6b1 100644
--- a/src/main/kotlin/com/bibireden/data_attributes/api/attribute/AttributeFormat.kt
+++ b/src/main/kotlin/com/bibireden/data_attributes/api/attribute/AttributeFormat.kt
@@ -1,9 +1,40 @@
 package com.bibireden.data_attributes.api.attribute
 
 import io.wispforest.endec.Endec
+import kotlin.math.abs
 
 enum class AttributeFormat(val function: (min: Double, max: Double, value: Double) -> String) {
-    Percentage ({min, max, value -> "%.2f".format((value - min) / ((max - min) / 100)) + "%" }),
+    Percentage ({min, max, value ->
+        var minimum = 0.0
+        var maximum: Double
+
+        val isNegative = value < 0.0
+        var final: Double
+
+        if (isNegative) {
+            if (max < 0)
+            {
+                minimum = max
+            }
+
+
+            maximum = min
+
+
+            final = (value + minimum) / (maximum + minimum)
+        } else {
+            if (min > 0)
+            {
+                minimum = min
+            }
+
+            maximum = max
+
+            final = (value - minimum)/(maximum-minimum)
+        }
+
+        "%.2f".format(final * 100) + "%"
+    }),
     Whole({_, _, value -> "%.2f".format(value) } );
 
     companion object {
diff --git a/src/main/kotlin/com/bibireden/data_attributes/config/entities/EntityTypeEntry.kt b/src/main/kotlin/com/bibireden/data_attributes/config/entities/EntityTypeEntry.kt
index fb9086a..cfb117b 100644
--- a/src/main/kotlin/com/bibireden/data_attributes/config/entities/EntityTypeEntry.kt
+++ b/src/main/kotlin/com/bibireden/data_attributes/config/entities/EntityTypeEntry.kt
@@ -13,7 +13,7 @@ data class EntityTypeEntry(var value: Double = 0.0, var fallback: Double? = null
     companion object {
         val ENDEC: Endec<EntityTypeEntry> = StructEndecBuilder.of(
             Endec.DOUBLE.fieldOf("value") { it.value },
-            Endec.DOUBLE.nullableOf().fieldOf("fallback", { it.fallback }),
+            Endec.DOUBLE.nullableOf().fieldOf("fallback") { it.fallback },
             ::EntityTypeEntry
         )
     }
diff --git a/src/main/kotlin/com/bibireden/data_attributes/ui/config/providers/EntityTypesProvider.kt b/src/main/kotlin/com/bibireden/data_attributes/ui/config/providers/EntityTypesProvider.kt
index 8471923..0e71f34 100644
--- a/src/main/kotlin/com/bibireden/data_attributes/ui/config/providers/EntityTypesProvider.kt
+++ b/src/main/kotlin/com/bibireden/data_attributes/ui/config/providers/EntityTypesProvider.kt
@@ -110,10 +110,15 @@ class EntityTypesProvider(val option: Option<Map<Identifier, EntityTypeData>>) :
             ct.id(id.toString())
 
             // find fallback
-            entityTypeEntry.fallback = Registries.ENTITY_TYPE.get(parentId)?.let { entityType ->
-                val defaultContainer = DefaultAttributeRegistry.get(entityType as EntityType<LivingEntity>)
-                Registries.ATTRIBUTE.get(id)?.let(defaultContainer::getBaseValue)
-            }?.round(2)
+            try {
+                entityTypeEntry.fallback = Registries.ENTITY_TYPE.get(parentId)?.let { entityType ->
+                    val defaultContainer = DefaultAttributeRegistry.get(entityType as EntityType<LivingEntity>)
+                    Registries.ATTRIBUTE.get(id)?.let(defaultContainer::getBaseValue)
+                }?.round(2)
+            }
+            catch (_: IllegalArgumentException) {
+                entityTypeEntry.fallback = 0.0
+            }
 
             if (!isDefault) {
                 ct.child(Containers.horizontalFlow(Sizing.fill(100), Sizing.fixed(15))