diff --git a/jeecg-module-beta-gamma-analyser/src/main/java/org/jeecg/common/util/SelfBaseUtil.java b/jeecg-module-beta-gamma-analyser/src/main/java/org/jeecg/common/util/SelfBaseUtil.java
index e594ecf1..e2be4744 100644
--- a/jeecg-module-beta-gamma-analyser/src/main/java/org/jeecg/common/util/SelfBaseUtil.java
+++ b/jeecg-module-beta-gamma-analyser/src/main/java/org/jeecg/common/util/SelfBaseUtil.java
@@ -863,6 +863,7 @@ public class SelfBaseUtil extends AbstractLogOrReport {
                 for (int i = (int)lc; i <= (int) rc; i++) {
                     area += counts.get(i);
                 }
+                nuclideParam.put("exist", false);
                 nuclideParam.put("area", area+"");
             }
             param.put(mapKey, nuclideParam);