diff --git a/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/FriendlyStreams.kt b/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/FriendlyStreams.kt
index ef31ac554..d13b20bb5 100644
--- a/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/FriendlyStreams.kt
+++ b/src/main/kotlin/ru/dbotthepony/mc/otm/core/util/FriendlyStreams.kt
@@ -212,6 +212,8 @@ fun OutputStream.writeJson(element: JsonElement) {
 		} else {
 			write(TYPE_NULL)
 		}
+	} else if (element is JsonNull) {
+		write(TYPE_NULL)
 	} else {
 		throw IllegalArgumentException("Unknown element type: ${element::class.qualifiedName}")
 	}