diff --git a/trac/web/main.py b/trac/web/main.py
index 32f8c480e5..8a1697c3bf 100644
--- a/trac/web/main.py
+++ b/trac/web/main.py
@@ -286,9 +286,13 @@ def dispatch(self, req):
             except RequestDone:
                 pass
             except Exception as e2:
-                self.log.error("Exception caught while post-processing"
-                               " request: %s",
-                               exception_to_unicode(e2, traceback=True))
+                if isinstance(e, TracError):
+                    self.log.warning("Exception caught while post-processing"
+                                     " request: %s", exception_to_unicode(e2))
+                else:
+                    self.log.error("Exception caught while post-processing"
+                                   " request: %s",
+                                   exception_to_unicode(e2, traceback=True))
             if isinstance(e, PermissionError):
                 raise HTTPForbidden(e)
             if isinstance(e, ResourceNotFound):