diff --git a/css/css.go b/css/css.go
index a0a3eb6544..0d0366d79f 100644
--- a/css/css.go
+++ b/css/css.go
@@ -131,7 +131,7 @@ func (c *cssMinifier) minifySelectors(property []byte, values []css.Token) error
 			inAttr = true
 		} else if inAttr && val.TokenType == css.RightBracketToken {
 			inAttr = false
-		} else if inAttr && val.TokenType == css.StringToken {
+		} else if inAttr && val.TokenType == css.StringToken && len(val.Data) > 2 {
 			s := val.Data[1 : len(val.Data)-1]
 			if css.IsIdent([]byte(s)) {
 				if _, err := c.w.Write(s); err != nil {
diff --git a/css/css_test.go b/css/css_test.go
index 26ebb13f92..02e00aa8bc 100644
--- a/css/css_test.go
+++ b/css/css_test.go
@@ -120,6 +120,7 @@ func TestCSS(t *testing.T) {
 
 	// go-fuzz
 	assertCSS(t, m, false, "FONT-FAMILY: ru\"", "font-family:ru")
+	assertCSS(t, m, true, "input[type=\"\x00\"] {  a: b\n}.a{}", "input[type=\"\x00\"] {  a: b\n}.a{}")
 }
 
 ////////////////////////////////////////////////////////////////