diff --git a/lib/committee/parameter_coercer.rb b/lib/committee/parameter_coercer.rb
index eb732487..36d57e18 100644
--- a/lib/committee/parameter_coercer.rb
+++ b/lib/committee/parameter_coercer.rb
@@ -9,6 +9,8 @@ def initialize(params, schema, options = {})
 
     def call
       coerced = {}
+      return coerced unless @schema.respond_to?(:properties)
+
       @schema.properties.each do |k, s|
         original_val = @params[k]
 
diff --git a/test/middleware/request_validation_test.rb b/test/middleware/request_validation_test.rb
index 13ed06f3..ff0bccdd 100644
--- a/test/middleware/request_validation_test.rb
+++ b/test/middleware/request_validation_test.rb
@@ -38,6 +38,13 @@ def app
     assert_match /invalid request/i, last_response.body
   end
 
+  it "pass non-exist schema link and coerce_date_times option enable" do
+    @app = new_rack_app(coerce_date_times: true, schema: hyper_schema)
+    header "Content-Type", "application/json"
+    get "/apps", JSON.generate({})
+    assert_equal 200, last_response.status
+  end
+
   it "detects an invalid request" do
     @app = new_rack_app(schema: hyper_schema)
     header "Content-Type", "application/json"