diff --git a/PEIS/View/Setting/HazardTypeForm.cs b/PEIS/View/Setting/HazardTypeForm.cs
index 8470c3f..0873839 100644
--- a/PEIS/View/Setting/HazardTypeForm.cs
+++ b/PEIS/View/Setting/HazardTypeForm.cs
@@ -150,7 +150,11 @@ namespace PEIS.View.Setting
         {
             int hazardTypeIndex = gVHazardType.FocusedRowHandle;
             var hazardTypeRow = gVHazardType.GetRow(hazardTypeIndex) as DictHazardType;
-            GetHTypeFItem?.Invoke(this, new Args<HTypeFItemInfo>() { Eid = hazardTypeRow.ID });
+            if (hazardTypeRow!=null)
+            {
+                GetHTypeFItem?.Invoke(this, new Args<HTypeFItemInfo>() { Eid = hazardTypeRow.ID });
+            }
+            
         }
         private void TsmiDelete_Click(object sender, EventArgs e)
         {