diff --git a/sentry-rails/lib/sentry/rails/controller_transaction.rb b/sentry-rails/lib/sentry/rails/controller_transaction.rb
index 7e8d1c673..ba622c28f 100644
--- a/sentry-rails/lib/sentry/rails/controller_transaction.rb
+++ b/sentry-rails/lib/sentry/rails/controller_transaction.rb
@@ -29,7 +29,7 @@ def sentry_around_action
                 data_collection = Sentry.configuration.data_collection
 
                 path = request.path
-                query_parameters = request.query_parameters
+                query_parameters = request.query_parameters rescue nil
 
                 if query_parameters.is_a?(Hash)
                   filtered_query_parameters = data_collection.url_query_params.filter(query_parameters)
@@ -43,7 +43,7 @@ def sentry_around_action
                 child_span.set_data(:path, path)
 
                 # all params request + body
-                params = request.params
+                params = request.params rescue nil
                 if params.is_a?(Hash)
                   filtered_params = data_collection.url_query_params.filter(params)
                   child_span.set_data(:params, filtered_params)
diff --git a/sentry-rails/spec/dummy/test_rails_app/app/controllers/posts_controller.rb b/sentry-rails/spec/dummy/test_rails_app/app/controllers/posts_controller.rb
index c4d4ad055..22c01ddf6 100644
--- a/sentry-rails/spec/dummy/test_rails_app/app/controllers/posts_controller.rb
+++ b/sentry-rails/spec/dummy/test_rails_app/app/controllers/posts_controller.rb
@@ -12,6 +12,11 @@ def show
     render plain: p.id
   end
 
+  def webhook
+    request.raw_post
+    head :ok
+  end
+
   def attach
     p = Post.find(params[:id])
 
diff --git a/sentry-rails/spec/sentry/rails/tracing_spec.rb b/sentry-rails/spec/sentry/rails/tracing_spec.rb
index 0aed6810f..55028ea0d 100644
--- a/sentry-rails/spec/sentry/rails/tracing_spec.rb
+++ b/sentry-rails/spec/sentry/rails/tracing_spec.rb
@@ -15,11 +15,26 @@
     before do
       expect(described_class).to receive(:subscribe_tracing_events).and_call_original
 
-      make_basic_app do |config|
+      make_basic_app do |config, app|
         config.traces_sample_rate = 1.0
+        app.routes.append do
+          post "/malformed", to: "posts#webhook"
+        end
       end
     end
 
+    it "does not replace a response when request parameters cannot be parsed" do
+      skip "Rails parses request parameters before controller callbacks" if Rails::VERSION::MAJOR < 6
+
+      response = Rack::MockRequest.new(Rails.application).post(
+        "/malformed",
+        input: "not json",
+        "CONTENT_TYPE" => "application/json"
+      )
+
+      expect(response.status).to eq(200)
+    end
+
     it "records transaction with exception" do
       get "/posts"