diff --git a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/cardcli/CardCliUtil.java b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/cardcli/CardCliUtil.java
index 6ac4384..73f85da 100644
--- a/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/cardcli/CardCliUtil.java
+++ b/yubikey-ca-java/src/main/java/me/hatter/tools/yubikeyca/cardcli/CardCliUtil.java
@@ -84,13 +84,7 @@ public class CardCliUtil {
         final String outputs;
         final String errorOutputs;
         try {
-            final List<String> commandList = new ArrayList<>(pb.command());
-            for (int i = 0; i < commandList.size(); i++) {
-                final String c = commandList.get(i);
-                if (StringUtil.equals("--pin", c) && ((i + 1) < commandList.size())) {
-                    commandList.set(i + 1, "******");
-                }
-            }
+            final List<String> commandList = getDesensitizedCommands(pb);
             log.info("Run command: " + StringUtil.join(commandList, " "));
             final Process p = pb.start();
             final byte[] outputsBytes = IOUtil.readToBytes(p.getInputStream());
@@ -104,8 +98,19 @@ public class CardCliUtil {
             if (StringUtil.isNotEmpty(StringUtil.trim(errorOutputs))) {
                 log.error("Error outputs: " + errorOutputs);
             }
-            throw new RuntimeException("Outputs is empty!");
+            throw new RuntimeException("Outputs is empty! Please insert or reinsert your card.");
         }
         return outputs;
     }
+
+    private static List<String> getDesensitizedCommands(ProcessBuilder pb) {
+        final List<String> commandList = new ArrayList<>(pb.command());
+        for (int i = 0; i < commandList.size(); i++) {
+            final String c = commandList.get(i);
+            if (StringUtil.equals("--pin", c) && ((i + 1) < commandList.size())) {
+                commandList.set(i + 1, "******");
+            }
+        }
+        return commandList;
+    }
 }