youhua

src/main/java/cloud/tianai/captcha/template/slider/DefaultSliderCaptchaTemplate.java

@@ -425,6 +425,9 @@ public class DefaultSliderCaptchaTemplate implements SliderCaptchaTemplate {
     }
 
     private URL getRandomResourceImage() {
+        if (resourceImageFiles.size() == 1) {
+            return resourceImageFiles.get(0);
+        }
         int targetNo = ThreadLocalRandom.current().nextInt(resourceImageFiles.size());
         return resourceImageFiles.get(targetNo);
     }