diff --git a/lib/mollie/client.rb b/lib/mollie/client.rb
index 63d1686..068c243 100644
--- a/lib/mollie/client.rb
+++ b/lib/mollie/client.rb
@@ -133,7 +133,7 @@ def perform_http_call(http_method, api_method, id = nil, http_body = {}, query =
         exception = ResourceNotFoundError.new(json, response)
         raise exception
       else
-        json = JSON.parse(response.body)
+        json = parse_body(response)
         exception = Mollie::RequestError.new(json, response)
         raise exception
       end
@@ -162,5 +162,15 @@ def build_nested_query(value, prefix = nil)
     def escape(s)
       URI.encode_www_form_component(s)
     end
+
+    def parse_body(response)
+      JSON.parse(response.body)
+    rescue JSON::ParserError => e
+      {
+        "status" => response.code.to_i,
+        "title" => response.message,
+        "detail" => "Unable to parse JSON: #{e.message}"
+      }
+    end
   end
 end
diff --git a/test/mollie/client_test.rb b/test/mollie/client_test.rb
index afe8894..641385e 100644
--- a/test/mollie/client_test.rb
+++ b/test/mollie/client_test.rb
@@ -177,5 +177,18 @@ def test_404_response
       assert_equal(json['field'],  e.field)
       assert_equal(json['_links'], e.links)
     end
+
+    def test_invalid_response
+      stub_request(:post, 'https://api.mollie.com/v2/my-method')
+        .to_return(status: [500, "Internal server error"], body: "<h1>Internal server error</h1>", headers: {})
+
+      e = assert_raise Mollie::RequestError do
+        client.perform_http_call('POST', 'my-method', nil, {})
+      end
+
+      assert_equal(500, e.status)
+      assert_equal('Internal server error', e.title)
+      assert_match(/Unable to parse JSON:.*/, e.detail)
+    end
   end
 end