diff --git a/lib/intercom/client.rb b/lib/intercom/client.rb
index 883a99a..2af550f 100644
--- a/lib/intercom/client.rb
+++ b/lib/intercom/client.rb
@@ -156,7 +156,7 @@ def execute_request(request)
       request.handle_rate_limit = handle_rate_limit
       request.execute(@base_url, token: @token, api_version: @api_version, **timeouts)
     ensure
-      @rate_limit_details = request.rate_limit_details
+      @rate_limit_details = request.rate_limit_details unless request.rate_limit_details.empty?
     end
 
     attr_writer :base_url
diff --git a/lib/intercom/request.rb b/lib/intercom/request.rb
index 0be7550..cb43af4 100644
--- a/lib/intercom/request.rb
+++ b/lib/intercom/request.rb
@@ -72,11 +72,11 @@ def execute(target_base_url = nil, token:, read_timeout: 90, open_timeout: 30, a
             parsed_body
           rescue Intercom::RateLimitExceeded => e
             if @handle_rate_limit
-              seconds_to_retry = (@rate_limit_details[:reset_at] - Time.now.utc).ceil
+              seconds_to_retry = ((@rate_limit_details[:reset_at] || Time.now.utc) - Time.now.utc).ceil
               if (retries -= 1) < 0
                 raise Intercom::RateLimitExceeded, 'Rate limit retries exceeded. Please examine current API Usage.'
               else
-                sleep seconds_to_retry unless seconds_to_retry < 0
+                sleep seconds_to_retry unless seconds_to_retry <= 0
                 retry
               end
             else
diff --git a/spec/unit/intercom/client_spec.rb b/spec/unit/intercom/client_spec.rb
index 660c49d..3e7b114 100644
--- a/spec/unit/intercom/client_spec.rb
+++ b/spec/unit/intercom/client_spec.rb
@@ -87,6 +87,14 @@ module Intercom
 
         client.get('/contacts', id: '123')
       end
+
+      it 'sets rate limit details to empty hash' do
+        stub_request(:any, "https://api.intercom.io/test").to_raise(StandardError)
+
+        expect { client.get('/test', {}) }.must_raise(StandardError)
+
+        client.rate_limit_details.must_equal({})
+      end
     end
 
     describe 'OAuth clients' do
diff --git a/spec/unit/intercom/request_spec.rb b/spec/unit/intercom/request_spec.rb
index 2310bc7..cb7a5f1 100644
--- a/spec/unit/intercom/request_spec.rb
+++ b/spec/unit/intercom/request_spec.rb
@@ -51,6 +51,17 @@ def execute!
     execute!
   end
 
+  it 'should not call sleep for rate limit if reset is not received' do
+    stub_request(:any, uri).to_return(
+      status: [429, "Too Many Requests"],
+    ).then.to_return(status: [200, "OK"], body: default_body)
+
+    req.handle_rate_limit=true
+    req.expects(:sleep).never.with(any_parameters)
+
+    execute!
+  end
+
   it 'should not sleep if rate limit reset time has passed' do
     stub_request(:any, uri).to_return(
       status: [429, "Too Many Requests"],