diff --git a/core/src/main/kotlin/build/Model.kt b/core/src/main/kotlin/build/Model.kt
index 5a7769210..5b06142d9 100644
--- a/core/src/main/kotlin/build/Model.kt
+++ b/core/src/main/kotlin/build/Model.kt
@@ -35,7 +35,7 @@ data class AgentBuildData(
 }
 
 @Serializable
-data class CodeData(val classBytes: Map<String, ByteArray>)
+data class CodeData(val classBytes: Map<String, ByteArray> = emptyMap())
 
 @Serializable
 data class DiffTypeMethods(