diff --git a/middleware.go b/middleware.go
index ece360b..0eee5ed 100644
--- a/middleware.go
+++ b/middleware.go
@@ -55,7 +55,8 @@ func ErrorMiddleware(opts ...Option) gin.HandlerFunc {
 
 		c.Set("rendered_error", re)
 
-		// @todo check a response hasn't already been sent
-		c.JSON(re.Status(), re)
+		if !c.Writer.Written() {
+			c.JSON(re.Status(), re)
+		}
 	}
 }