DiffLog Bug

Src/Asp.Net/SqlSugar/Abstract/InsertableProvider/InsertableProvider.cs

@@ -640,7 +640,7 @@ namespace SqlSugar
                         DiffLogColumnInfo addItem = new DiffLogColumnInfo();
                         addItem.Value = row[col.ColumnName];
                         addItem.ColumnName = col.ColumnName;
-                        addItem.ColumnDescription = this.EntityInfo.Columns.First(it => it.DbColumnName.Equals(col.ColumnName, StringComparison.CurrentCultureIgnoreCase)).ColumnDescription;
+                        addItem.ColumnDescription = this.EntityInfo.Columns.Where(it=>it.DbColumnName!=null).First(it => it.DbColumnName.Equals(col.ColumnName, StringComparison.CurrentCultureIgnoreCase)).ColumnDescription;
                         item.Columns.Add(addItem);
                     }
                     result.Add(item);

Src/Asp.Net/SqlSugar/Abstract/UpdateProvider/UpdateableProvider.cs

@@ -745,7 +745,7 @@ namespace SqlSugar
                         DiffLogColumnInfo addItem = new DiffLogColumnInfo();
                         addItem.Value = row[col.ColumnName];
                         addItem.ColumnName = col.ColumnName;
-                        addItem.ColumnDescription = this.EntityInfo.Columns.First(it => it.DbColumnName.Equals(col.ColumnName, StringComparison.CurrentCultureIgnoreCase)).ColumnDescription;
+                        addItem.ColumnDescription = this.EntityInfo.Columns.Where(it=>it.DbColumnName!=null).First(it => it.DbColumnName.Equals(col.ColumnName, StringComparison.CurrentCultureIgnoreCase)).ColumnDescription;
                         item.Columns.Add(addItem);
                     }
                     result.Add(item);