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-rw-r--r--src/LightBox.js4
1 files changed, 2 insertions, 2 deletions
diff --git a/src/LightBox.js b/src/LightBox.js
index 5479819..e2094c1 100644
--- a/src/LightBox.js
+++ b/src/LightBox.js
@@ -216,10 +216,10 @@ export class LightBox {
}, this.options.animationSpeed);
if (this.options.preloadNext) {
- let index = Array.prototype.indexOf.call(this.targets, this.target)
+ let index = Array.prototype.indexOf.call(this.targets, this.target);
let next = this.targets[index + 1];
- if (next !== null) {
+ if (next !== null && next !== undefined) {
log.debug('preloading next');
let nextImg = new Image();
nextImg.src = next.href;