diff --git a/context/context.go b/context/context.go
index e703c2d4..0e823034 100644
--- a/context/context.go
+++ b/context/context.go
@@ -2842,8 +2842,8 @@ func (ctx *Context) ReadYAML(outPtr interface{}) error {
 
 var (
 	// IsErrEmptyJSON reports whether the given "err" is caused by a
-	// Context.ReadJSON call when the request body
-	// didn't start with { or it was totally empty.
+	// Client.ReadJSON call when the request body was empty or
+	// didn't start with { or [.
 	IsErrEmptyJSON = func(err error) bool {
 		if err == nil {
 			return false
@@ -2858,8 +2858,9 @@ var (
 			return v.Offset == 0 && v.Error() == "unexpected end of JSON input"
 		}
 
-		// when optimization is enabled, the jsoniter will report the following error:
-		return strings.Contains(err.Error(), "readObjectStart: expect {")
+		errMsg := err.Error()
+		// 3rd party pacakges:
+		return strings.Contains(errMsg, "readObjectStart: expect {") || strings.Contains(errMsg, "readArrayStart: expect [")
 	}
 
 	// IsErrPath can be used at `context#ReadForm` and `context#ReadQuery`.
diff --git a/iris_guide.go b/iris_guide.go
index a05f8781..aa5c49d1 100644
--- a/iris_guide.go
+++ b/iris_guide.go
@@ -557,6 +557,9 @@ func (s *step7) Run(runner Runner, configurators ...Configurator) error {
 		// they will be called on interrupt signals too,
 		// because Iris has a builtin mechanism to call server's shutdown on interrupt.
 		for _, cb := range s.step6.closers {
+			if cb == nil {
+				continue
+			}
 			cb()
 		}
 	}()