diff --git a/src/components/occDisease/OccDiseaseHistory.vue b/src/components/occDisease/OccDiseaseHistory.vue
index 37a6c83..d09fe56 100644
--- a/src/components/occDisease/OccDiseaseHistory.vue
+++ b/src/components/occDisease/OccDiseaseHistory.vue
@@ -206,7 +206,12 @@ export default {
       this.poisonList = deepCopy(this.dict.poisonList)
       
       this.poison = this.madeSelectGroup(this.poisonList)
-      this.choosedPoison = this.dataTransOpts.tableM.patient_occupational_history[index]['poison'].split(",")
+      if(this.dataTransOpts.tableM.patient_occupational_history[index]['poison']){
+        this.choosedPoison = this.dataTransOpts.tableM.patient_occupational_history[index]['poison'].split(",")
+      }else{
+        this.choosedPoison = []
+      }
+      
       this.dialogPoison = true
     },