diff --git a/app/src/main/java/io/nekohasekai/sagernet/ktx/Utils.kt b/app/src/main/java/io/nekohasekai/sagernet/ktx/Utils.kt
index 7649b5b1..9d6b9d11 100644
--- a/app/src/main/java/io/nekohasekai/sagernet/ktx/Utils.kt
+++ b/app/src/main/java/io/nekohasekai/sagernet/ktx/Utils.kt
@@ -270,7 +270,7 @@ fun <T> Continuation<T>.tryResumeWithException(exception: Throwable) {
 }
 
 fun <T : Any> T.asMap(): MutableMap<String, Any> {
-    if (!shouldAsMap(this)) throw RuntimeException("invalid type to as map")
+    if (!shouldAsMap(this)) throw RuntimeException("invalid type to as map: " + javaClass.name)
 
     val map = mutableMapOf<String, Any>()
 
@@ -294,7 +294,7 @@ fun <T : Any> T.asMap(): MutableMap<String, Any> {
 }
 
 private fun shouldAsMap(value: Any?): Boolean = when (value) {
-    null, is String, is Number, is Boolean, is Map<*, *> -> false
+    null, is String, is Number, is Boolean, is Map<*, *>, is List<*> -> false
     else -> true
 }
 
@@ -305,11 +305,7 @@ private fun mappedValue(value: Any?): Any? = when (value) {
         0 -> null
 
         // Listable
-        1 -> if (shouldAsMap(value[0])) {
-            value.asMap()
-        } else {
-            value[0]
-        }
+        1 -> mappedValue(value[0])
 
         else -> {
             val needAsMap = shouldAsMap(value[0])