1 files changed, 7 insertions, 0 deletions
diff --git a/col.go b/col.go
index f51336d..c0deb58 100644
--- a/col.go
+++ b/col.go
@@ -415,6 +415,13 @@ func (f *File) SetColStyle(sheet, columns string, styleID int) error {
 	if err != nil {
 		return err
 	}
+	s := f.stylesReader()
+	s.Lock()
+	if styleID < 0 || s.CellXfs == nil || len(s.CellXfs.Xf) <= styleID {
+		s.Unlock()
+		return newInvalidStyleID(styleID)
+	}
+	s.Unlock()
 	ws, err := f.workSheetReader(sheet)
 	if err != nil {
 		return err