....

src/main/java/cn/com/qmth/examcloud/web/support/ExamCloudController.java

@@ -32,7 +32,7 @@ public class ExamCloudController {
 	@Naked
 	@RequestMapping(value = {"/", ""}, method = RequestMethod.GET)
 	public String get(@RequestParam(required = false) Boolean bug) {
-		if (bug) {
+		if (null != bug && bug) {
 			if (RandomUtils.nextBoolean()) {
 				throw new RuntimeException("Ha Ha Ha ... ...");
 			}