diff --git a/app/src/main/java/com/github/shadowsocks/plugin/v2ray/ConfigFragment.kt b/app/src/main/java/com/github/shadowsocks/plugin/v2ray/ConfigFragment.kt
index 53ae617..4e32d27 100644
--- a/app/src/main/java/com/github/shadowsocks/plugin/v2ray/ConfigFragment.kt
+++ b/app/src/main/java/com/github/shadowsocks/plugin/v2ray/ConfigFragment.kt
@@ -59,7 +59,7 @@ class ConfigFragment : PreferenceFragmentCompat(), Preference.OnPreferenceChange
         putWithDefault("tls", tls)
         putWithDefault("host", host.text, "cloudfront.com")
         putWithDefault("path", path.text, "/")
-        putWithDefault("certRaw", certRaw.text.replace("\n", ""), "")
+        putWithDefault("certRaw", certRaw.text?.replace("\n", ""), "")
         putWithDefault("loglevel", loglevel.value, "warning")
     }