1 files changed, 2 insertions, 3 deletions
diff --git a/src/lib/frame.ts b/src/lib/frame.ts
index aff6d31..8ed1316 100644
--- a/src/lib/frame.ts
+++ b/src/lib/frame.ts
@@ -24,14 +24,13 @@ export function data(
  */
 export function header(
   this: Frame,
-  header: Array<string>
+  header?: Array<string>
 ): Array<string> | any {
-  if (!header || header.length) {
+  if (!header?.length) {
     this.columns = generateHeader(this.rowdata);
   } else {
     this.columns = setHeader(this.rowdata, header);
   }
-
   return this;
 }