From d8c644c64b5b20aee5eb34326a0a9e2493b2ed27 Mon Sep 17 00:00:00 2001
From: DBotThePony <dbotthepony@yandex.ru>
Date: Mon, 23 Jan 2023 16:45:08 +0700
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---
 .../kstarbound/io/json/builder/BuilderAdapter.kt            | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/main/kotlin/ru/dbotthepony/kstarbound/io/json/builder/BuilderAdapter.kt b/src/main/kotlin/ru/dbotthepony/kstarbound/io/json/builder/BuilderAdapter.kt
index dfa9f449..650b71fd 100644
--- a/src/main/kotlin/ru/dbotthepony/kstarbound/io/json/builder/BuilderAdapter.kt
+++ b/src/main/kotlin/ru/dbotthepony/kstarbound/io/json/builder/BuilderAdapter.kt
@@ -359,8 +359,10 @@ class BuilderAdapter<T : Any> private constructor(
 			}
 
 			for (parent in input.supertypes) {
-				if (parent.classifier is KClass<*>) {
-					collectDecl(parent.classifier as KClass<*>, output)
+				val classifier = parent.classifier
+
+				if (classifier is KClass<*> && !classifier.java.isInterface) {
+					collectDecl(classifier, output)
 				}
 			}
 		}