diff --git a/completion.go b/completion.go
index 0405b90d..0ae50f21 100644
--- a/completion.go
+++ b/completion.go
@@ -42,15 +42,14 @@ type CompletionManager struct {
 
 // GetSelectedSuggestion returns the selected item.
 func (c *CompletionManager) GetSelectedSuggestion() (s Suggest, ok bool) {
-	if c.selected == -1 {
+	if c.selected == -1 || c.selected >= len(c.tmp) {
 		return Suggest{}, false
 	} else if c.selected < -1 {
 		debug.Assert(false, "must not reach here")
 		c.selected = -1
 		return Suggest{}, false
-	} else if c.selected >= len(c.tmp) {
-		return Suggest{}, false
 	}
+
 	return c.tmp[c.selected], true
 }
 
diff --git a/prompt.go b/prompt.go
index 3c9c4460..5427917d 100644
--- a/prompt.go
+++ b/prompt.go
@@ -4,6 +4,8 @@ import (
 	"bytes"
 	"os"
 	"time"
+	"unicode"
+	"unicode/utf8"
 
 	"github.com/c-bata/go-prompt/internal/debug"
 )
@@ -157,6 +159,11 @@ func (p *Prompt) feed(b []byte) (shouldExit bool, exec *Exec) {
 		if p.handleASCIICodeBinding(b) {
 			return
 		}
+		char, _ := utf8.DecodeRune(b)
+		if unicode.IsControl(char) {
+			return
+		}
+
 		p.buf.InsertText(string(b), false, true)
 	}