diff --git a/sanic/sanic.py b/sanic/sanic.py
index 033b1e9d..2f5a405a 100644
--- a/sanic/sanic.py
+++ b/sanic/sanic.py
@@ -217,6 +217,14 @@ class Sanic:
             # -------------------------------------------- #
             # Response Generation Failed
             # -------------------------------------------- #
+            if self.debug:
+                error_body = response.body
+                if isinstance(error_body, bytes):
+                    try:
+                        error_body = error_body.decode()
+                    except:
+                        pass
+                log.debug(error_body)
 
             try:
                 response = self.error_handler.response(request, e)