diff --git a/lib/rspec_api_documentation/client_base.rb b/lib/rspec_api_documentation/client_base.rb
index db0560a3..43824d1c 100644
--- a/lib/rspec_api_documentation/client_base.rb
+++ b/lib/rspec_api_documentation/client_base.rb
@@ -45,8 +45,8 @@ def process(method, path, params = {}, headers ={})
 
     def read_request_body
       input = last_request.env["rack.input"]
-      input.rewind
-      input.read
+      input&.rewind
+      input&.read || ""
     end
 
     def document_example(method, path)