diff --git a/src/main/kotlin/de/bixilon/pixlyzer/generator/generators/BlockGenerator.kt b/src/main/kotlin/de/bixilon/pixlyzer/generator/generators/BlockGenerator.kt
index c9109a5..9dfad5e 100644
--- a/src/main/kotlin/de/bixilon/pixlyzer/generator/generators/BlockGenerator.kt
+++ b/src/main/kotlin/de/bixilon/pixlyzer/generator/generators/BlockGenerator.kt
@@ -272,7 +272,9 @@ object BlockGenerator : Generator(
                 }
 
                 if (multipart.size() > 0 && !stateData.has("render")) {
-                    stateData.add("render", multipart)
+                    val multipartWrapper = JsonArray()
+                    multipartWrapper.add(multipart)
+                    stateData.add("render", multipartWrapper)
                 }
 
                 if (!block.hasDynamicBounds()) {