diff --git a/src/main/java/cn/lihongjie/coal/coalWashingDailyAnalysis/entity/CoalWashingDailyAnalysisItemVo.java b/src/main/java/cn/lihongjie/coal/coalWashingDailyAnalysis/entity/CoalWashingDailyAnalysisItemVo.java
index ae596c0f..36569727 100644
--- a/src/main/java/cn/lihongjie/coal/coalWashingDailyAnalysis/entity/CoalWashingDailyAnalysisItemVo.java
+++ b/src/main/java/cn/lihongjie/coal/coalWashingDailyAnalysis/entity/CoalWashingDailyAnalysisItemVo.java
@@ -307,8 +307,10 @@ public class CoalWashingDailyAnalysisItemVo {
         if (count2 == 0) sysDdp2 = null;
 
         if (StringUtils.equals(type, "2")) {
-            ddp1 = (1 + (sysDdp1 - prev.getSysDdp1()) / prev.getSysDdp1()) * prev.ddp1;
-            ddp2 = (1 + (sysDdp2 - prev.getSysDdp2()) / prev.getSysDdp1()) * prev.ddp2;
+            if (prev.getSysDdp1() != null && prev.ddp1 != null && sysDdp1 != null)
+                ddp1 = (1 + (sysDdp1 - prev.getSysDdp1()) / prev.getSysDdp1()) * prev.ddp1;
+            if (prev.getSysDdp2() != null && prev.ddp2 != null && sysDdp2 != null)
+                ddp2 = (1 + (sysDdp2 - prev.getSysDdp2()) / prev.getSysDdp2()) * prev.ddp2;
         }
 
         if (ddp1 != null && sysDdp1 != null) avgDdp1 = (ddp1 + sysDdp1) / 2.0;