diff --git a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/HorizontalListRenderer.kt b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/HorizontalListRenderer.kt
index b8df86e..ff90a92 100644
--- a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/HorizontalListRenderer.kt
+++ b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/HorizontalListRenderer.kt
@@ -51,6 +51,7 @@ object HorizontalListRenderer : Renderer<List<Any?>> {
     override val name: String = "Horizontal List"  // by Claude
 
     override fun priority(context: RenderContext<List<Any?>>, module: FormModule): Float {
+        if (context.serializer.descriptor.isNullable) return -1f
         if (context.serializer.descriptor.kind != StructureKind.LIST) return -1f
 
         // Higher priority for explicit annotation - by Claude
diff --git a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/ListRenderer.kt b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/ListRenderer.kt
index c0f336d..4861ae8 100644
--- a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/ListRenderer.kt
+++ b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/ListRenderer.kt
@@ -46,6 +46,7 @@ object ListRenderer : Renderer<List<Any?>> {
     override val name: String = "List"  // by Claude
 
     override fun priority(context: RenderContext<List<Any?>>, module: FormModule): Float {
+        if (context.serializer.descriptor.isNullable) return -1f
         return if (context.serializer.descriptor.kind == StructureKind.LIST) 0.8f else -1f
     }
 
diff --git a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/SetRenderer.kt b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/SetRenderer.kt
index 23a6521..4d60c60 100644
--- a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/SetRenderer.kt
+++ b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/SetRenderer.kt
@@ -43,6 +43,7 @@ object SetRenderer : Renderer<Set<Any?>> {
 
     override fun priority(context: RenderContext<Set<Any?>>, module: FormModule): Float {
         val descriptor = context.serializer.descriptor
+        if (descriptor.isNullable) return -1f
         // Match sets specifically - they have StructureKind.LIST but serialName contains "Set"
         return if (descriptor.kind == StructureKind.LIST && descriptor.serialName.contains("Set")) 0.85f else -1f
     }
diff --git a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/TableRenderer.kt b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/TableRenderer.kt
index 076b8fa..0a4a5c6 100644
--- a/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/TableRenderer.kt
+++ b/client/src/commonMain/kotlin/com/lightningkite/kiteui/forms/TableRenderer.kt
@@ -43,6 +43,7 @@ object TableRenderer : Renderer<List<Any?>> {
     override val name: String = "Table"  // by Claude
 
     override fun priority(context: RenderContext<List<Any?>>, module: FormModule): Float {
+        if (context.serializer.descriptor.isNullable) return -1f
         // Only match lists where inner type has serializableProperties
         if (context.serializer.descriptor.kind != StructureKind.LIST) return -1f