Error middleware does not write if the it is already written

logger.go

@@ -29,13 +29,14 @@ func ErrorLoggerT(typ uint32) HandlerFunc {
 	return func(c *Context) {
 		c.Next()
 
+		if !c.Writer.Written() {
 			errs := c.Errors.ByType(typ)
 			if len(errs) > 0 {
-			// -1 status code = do not change current one
 				c.JSON(-1, c.Errors)
 			}
 		}
 	}
+}
 
 func Logger() HandlerFunc {
 	return LoggerInFile(DefaultLogFile)