diff --git a/lib/bambora/v1/reports/merchants.rb b/lib/bambora/v1/reports/merchants.rb
index f313deb..b7626ee 100644
--- a/lib/bambora/v1/reports/merchants.rb
+++ b/lib/bambora/v1/reports/merchants.rb
@@ -16,6 +16,8 @@ def self.get(merchant_id, options = {})
             raise InvalidAuthenticationError, response
           end
 
+          raise InvalidRequestError, response if response == { Message: 'The request is invalid.' }
+
           response
         end
 
diff --git a/spec/bambora/v1/reports/merchants_spec.rb b/spec/bambora/v1/reports/merchants_spec.rb
index b70658a..1cdead8 100644
--- a/spec/bambora/v1/reports/merchants_spec.rb
+++ b/spec/bambora/v1/reports/merchants_spec.rb
@@ -34,7 +34,37 @@
       end
     end
 
-    context 'when the API request is authenticated' do
+    context 'when the API request is invalid' do
+      it 'raises Bambora::InvalidRequestError' do
+        WebMock
+          .stub_request(:get, 'https://api.na.bambora.com/v1/reports/merchants/372110001')
+          .with(
+            headers: {
+              'Authorization' => 'Passcode MzcyMTEwMDAwOjI4ODQwQ0VCOUg5RDNERkMyNEE0NDVCNzQ2MUZEOEZH',
+              'Content-Type' => 'application/json',
+            },
+          )
+          .to_return(
+            headers: {
+              'Content-Type' => 'application/json',
+            },
+            body: {
+              Message: 'The request is invalid.',
+            }.to_json,
+          )
+
+        credentials = Bambora::Credentials.new(
+          merchant_id: '372110000',
+          reporting_passcode: '28840CEB9H9D3DFC24A445B7461FD8FG',
+        )
+
+        expect { described_class.get(372_110_001, credentials: credentials) }.to(
+          raise_error(Bambora::InvalidRequestError),
+        )
+      end
+    end
+
+    context 'when the API request is authenticated and valid' do
       it 'returns merchant data for the merchant' do
         WebMock
           .stub_request(:get, 'https://api.na.bambora.com/v1/reports/merchants/372110001')