Fix iterator bug for uploading new file versions (#531)

Author: sujaygarlanka

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Next Release
+
+- Fix iterator bug for uploading new file versions ([#531](https://github.com/box/box-node-sdk/pull/531))
+
 ## 1.34.0 [2020-08-04]
 
 - Add zip functionality ([#525](https://github.com/box/box-node-sdk/pull/525))

lib/util/paging-iterator.js

@@ -160,6 +160,9 @@ class PagingIterator {
 		if (response.request.method === 'GET') {
 			this.options.qs[this.nextField] = this.nextValue;
 		} else if (response.request.method === 'POST') {
+			if (!this.options.body) {
+				this.options.body = {};
+			}
 			this.options.body[this.nextField] = this.nextValue;
 			let bodyString = JSON.stringify(this.options.body);
 			this.options.headers['content-length'] = bodyString.length;