Update V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: DHR60

V2rayNG/app/src/main/java/com/v2ray/ang/handler/V2rayConfigManager.kt

@@ -1348,7 +1348,12 @@ object V2rayConfigManager {
             }
         }
         finalMask?.let {
-            streamSettings.finalmask = JsonUtil.parseString(finalMask)
+            val parsedFinalMask = JsonUtil.parseString(finalMask)
+            if (parsedFinalMask != null) {
+                streamSettings.finalmask = parsedFinalMask
+            } else {
+                Log.w("V2rayConfigManager", "Invalid finalMask JSON, keeping previously generated finalmask")
+            }
         }
         return sni
     }