diff --git a/src/main/java/seedu/address/logic/commands/SortCommand.java b/src/main/java/seedu/address/logic/commands/SortCommand.java
index 9b8cfb3cece..814568cf03d 100644
--- a/src/main/java/seedu/address/logic/commands/SortCommand.java
+++ b/src/main/java/seedu/address/logic/commands/SortCommand.java
@@ -25,6 +25,8 @@ public class SortCommand extends Command {
 
     public static final String MESSAGE_SUCCESS = "List sorted based on %1$s in %2$s order";
     public static final String RESET_MESSAGE_SUCCESS = "List sorting set to default order.";
+    public static final String MESSAGE_INVALID_ORDER = "Order should only be asc or desc.";
+    public static final String MESSAGE_INVALID_FIELD = "Field should only be github, name, telegram or reset.";
     private final PersonComparator comparator;
 
     public SortCommand(PersonComparator comparator) {
diff --git a/src/main/java/seedu/address/logic/parser/DeleteCommandParser.java b/src/main/java/seedu/address/logic/parser/DeleteCommandParser.java
index 914f02bcefb..071d1b51d40 100644
--- a/src/main/java/seedu/address/logic/parser/DeleteCommandParser.java
+++ b/src/main/java/seedu/address/logic/parser/DeleteCommandParser.java
@@ -25,6 +25,8 @@ public DeleteCommand parse(String args) throws ParseException {
         if (!arePrefixesPresent(argMultimap, PREFIX_NAME) || !argMultimap.getPreamble().isEmpty()) {
             throw new ParseException(String.format(MESSAGE_INVALID_COMMAND_FORMAT, DeleteCommand.MESSAGE_USAGE));
         }
+        argMultimap.verifyNoDuplicatePrefixesFor(PREFIX_NAME);
+
         Name name = ParserUtil.parseName(argMultimap.getValue(PREFIX_NAME).get());
 
         return new DeleteCommand(name);
diff --git a/src/main/java/seedu/address/logic/parser/SortCommandParser.java b/src/main/java/seedu/address/logic/parser/SortCommandParser.java
index 3652f4e1853..63a73fe44d6 100644
--- a/src/main/java/seedu/address/logic/parser/SortCommandParser.java
+++ b/src/main/java/seedu/address/logic/parser/SortCommandParser.java
@@ -71,7 +71,7 @@ private static SortOrder parseSortOrder(String userInput) throws ParseException
         } else if (userInput.trim().equalsIgnoreCase("desc")) {
             return SortOrder.DESC;
         } else {
-            throw new ParseException(String.format(MESSAGE_INVALID_COMMAND_FORMAT, SortCommand.MESSAGE_USAGE));
+            throw new ParseException(SortCommand.MESSAGE_INVALID_ORDER);
         }
     }
 
@@ -87,7 +87,7 @@ private static SortField parseSortField(String userInput) throws ParseException
         case "telegram" -> SortField.TELEGRAM;
         case "reset" -> SortField.NONE;
         default ->
-                throw new ParseException(String.format(MESSAGE_INVALID_COMMAND_FORMAT, SortCommand.MESSAGE_USAGE));
+                throw new ParseException(SortCommand.MESSAGE_INVALID_FIELD);
         };
 
     }
diff --git a/src/test/java/seedu/address/logic/parser/SortCommandParserTest.java b/src/test/java/seedu/address/logic/parser/SortCommandParserTest.java
index d37a15f3e0a..0dd3bfbc98f 100644
--- a/src/test/java/seedu/address/logic/parser/SortCommandParserTest.java
+++ b/src/test/java/seedu/address/logic/parser/SortCommandParserTest.java
@@ -37,11 +37,11 @@ public void parse_emptyArg_throwsParseException() {
     public void parse_invalidValues_throwsParseException() {
         // invalid field
         assertParseFailure(parser, PREAMBLE_NON_EMPTY + ORDER_DESC_DESC,
-                String.format(MESSAGE_INVALID_COMMAND_FORMAT, SortCommand.MESSAGE_USAGE));
+                SortCommand.MESSAGE_INVALID_FIELD);
 
         // invalid order
         assertParseFailure(parser, VALID_FIELD_NAME + INVALID_ORDER_DESC,
-                String.format(MESSAGE_INVALID_COMMAND_FORMAT, SortCommand.MESSAGE_USAGE));
+                SortCommand.MESSAGE_INVALID_ORDER);
     }
 
     @Test