diff --git a/tornado_restless/handler.py b/tornado_restless/handler.py
index 844f50d..65877a4 100644
--- a/tornado_restless/handler.py
+++ b/tornado_restless/handler.py
@@ -244,7 +244,8 @@ def patch(self, instance_id: str=None):
             result = self.patch_single(self.parse_pk(instance_id))
 
         self._call_postprocessor(result=result)
-        self.finish(result)
+        if not self._finished:
+            self.finish(result)
 
     def patch_many(self) -> dict:
         """
@@ -364,7 +365,8 @@ def delete(self, instance_id: str=None):
             result = self.delete_single(self.parse_pk(instance_id))
 
         self._call_postprocessor(result=result)
-        self.finish(result)
+        if not self._finished:
+            self.finish(result)
 
     def delete_many(self) -> dict:
         """
@@ -455,7 +457,8 @@ def put(self, instance_id: str=None):
             result = self.put_single(self.parse_pk(instance_id))
 
         self._call_postprocessor(result=result)
-        self.finish(result)
+        if not self._finished:
+            self.finish(result)
 
     put_many = patch_many
     put_single = patch_single
@@ -480,7 +483,8 @@ def post(self, instance_id: str=None):
         result = self.post_single()
 
         self._call_postprocessor(result=result)
-        self.finish(result)
+        if not self._finished:
+            self.finish(result)
 
     def post_single(self):
         """
@@ -691,7 +695,8 @@ def get(self, instance_id: str=None):
             result = self.get_single(self.parse_pk(instance_id))
 
         self._call_postprocessor(result=result)
-        self.finish(result)
+        if not self._finished:
+            self.finish(result)
 
     def get_single(self, instance_id: list) -> dict:
         """