diff --git a/src/main/java/me/kavin/piped/utils/ResponseHelper.java b/src/main/java/me/kavin/piped/utils/ResponseHelper.java
index 310f045..b6cc9e3 100644
--- a/src/main/java/me/kavin/piped/utils/ResponseHelper.java
+++ b/src/main/java/me/kavin/piped/utils/ResponseHelper.java
@@ -84,6 +84,7 @@ import me.kavin.piped.utils.resp.AcceptedResponse;
 import me.kavin.piped.utils.resp.AlreadyRegisteredResponse;
 import me.kavin.piped.utils.resp.AuthenticationFailureResponse;
 import me.kavin.piped.utils.resp.IncorrectCredentialsResponse;
+import me.kavin.piped.utils.resp.InvalidRequestResponse;
 import me.kavin.piped.utils.resp.LoginResponse;
 import me.kavin.piped.utils.resp.SubscribeStatusResponse;
 
@@ -263,6 +264,9 @@ public class ResponseHelper {
     public static final byte[] trendingResponse(String region)
             throws ParsingException, ExtractionException, IOException {
 
+        if (region == null)
+            return Constants.mapper.writeValueAsBytes(new InvalidRequestResponse());
+
         final List<StreamItem> relatedStreams = new ObjectArrayList<>();
 
         KioskList kioskList = Constants.YOUTUBE_SERVICE.getKioskList();
@@ -515,6 +519,9 @@ public class ResponseHelper {
     public static final byte[] registerResponse(String user, String pass)
             throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
 
+        if (user == null || pass == null)
+            return Constants.mapper.writeValueAsBytes(new InvalidRequestResponse());
+
         user = user.toLowerCase();
 
         Session s = DatabaseSessionFactory.createSession();
@@ -544,6 +551,9 @@ public class ResponseHelper {
     public static final byte[] loginResponse(String user, String pass)
             throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {
 
+        if (user == null || pass == null)
+            return Constants.mapper.writeValueAsBytes(new InvalidRequestResponse());
+
         user = user.toLowerCase();
 
         Session s = DatabaseSessionFactory.createSession();
diff --git a/src/main/java/me/kavin/piped/utils/resp/InvalidRequestResponse.java b/src/main/java/me/kavin/piped/utils/resp/InvalidRequestResponse.java
new file mode 100644
index 0000000..e64852f
--- /dev/null
+++ b/src/main/java/me/kavin/piped/utils/resp/InvalidRequestResponse.java
@@ -0,0 +1,7 @@
+package me.kavin.piped.utils.resp;
+
+public class InvalidRequestResponse {
+
+    public String message = "Invalid request sent.";
+
+}