1 files changed, 1 insertions, 1 deletions
diff --git a/file.go b/file.go
index 80780d1..80c369c 100644
--- a/file.go
+++ b/file.go
@@ -119,7 +119,7 @@ func (f *file) initLines(content []byte, maxLine int) (err error) {
 		f.lines = f.lines[maxLine : nline-maxLine]
 	}
 
-	if bytes.HasPrefix(f.topLines[0], []byte(`#!`)) {
+	if len(f.topLines) != 0 && bytes.HasPrefix(f.topLines[0], []byte(`#!`)) {
 		f.hasSheBang = true
 	}
 	return nil