diff --git a/completion.go b/completion.go
index 57e82eef..dc0c69b2 100644
--- a/completion.go
+++ b/completion.go
@@ -43,7 +43,7 @@ type CompletionManager struct {
 func (c *CompletionManager) GetSelectedSuggestion() (s Suggest, ok bool) {
 	if c.selected == -1 {
 		return Suggest{}, false
-	} else if c.selected < -1 {
+	} else if c.selected < -1 || c.selected >= len(c.tmp) {
 		debug.Assert(false, "must not reach here")
 		c.selected = -1
 		return Suggest{}, false
diff --git a/input.go b/input.go
index 307e7471..2ad87471 100644
--- a/input.go
+++ b/input.go
@@ -43,8 +43,8 @@ var ASCIISequences = []*ASCIICode{
 	{Key: ControlF, ASCIICode: []byte{0x6}},
 	{Key: ControlG, ASCIICode: []byte{0x7}},
 	{Key: ControlH, ASCIICode: []byte{0x8}},
-	//{Key: ControlI, ASCIICode: []byte{0x9}},
-	//{Key: ControlJ, ASCIICode: []byte{0xa}},
+	// {Key: ControlI, ASCIICode: []byte{0x9}},
+	// {Key: ControlJ, ASCIICode: []byte{0xa}},
 	{Key: ControlK, ASCIICode: []byte{0xb}},
 	{Key: ControlL, ASCIICode: []byte{0xc}},
 	{Key: ControlM, ASCIICode: []byte{0xd}},
@@ -113,8 +113,8 @@ var ASCIISequences = []*ASCIICode{
 	{Key: F8, ASCIICode: []byte{0x1b, 0x5b, 0x31, 0x39, 0x7e}},
 	{Key: F9, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x30, 0x7e}},
 	{Key: F10, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x31, 0x7e}},
-	{Key: F11, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x32, 0x7e}},
-	{Key: F12, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x34, 0x7e, 0x8}},
+	{Key: F11, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x33, 0x7e}},
+	{Key: F12, ASCIICode: []byte{0x1b, 0x5b, 0x32, 0x34, 0x7e}},
 	{Key: F13, ASCIICode: []byte{0x1b, 0x5b, 0x25, 0x7e}},
 	{Key: F14, ASCIICode: []byte{0x1b, 0x5b, 0x26, 0x7e}},
 	{Key: F15, ASCIICode: []byte{0x1b, 0x5b, 0x28, 0x7e}},
diff --git a/prompt.go b/prompt.go
index 173cd517..be096bca 100644
--- a/prompt.go
+++ b/prompt.go
@@ -154,6 +154,9 @@ func (p *Prompt) feed(b []byte) (shouldExit bool, exec *Exec) {
 		if p.handleASCIICodeBinding(b) {
 			return
 		}
+		if len(b) > 0 && (b[0] <= 0x1f || b[0] == 0x7f) {
+			break
+		}
 		p.buf.InsertText(string(b), false, true)
 	}