Add error check for nil pointers passed as arguments to Delete()

ksql.go

@@ -583,6 +583,13 @@ func normalizeIDsAsMaps(idNames []string, ids []interface{}) ([]map[string]inter
 	for i := range ids {
 		t := reflect.TypeOf(ids[i])
 		switch t.Kind() {
+		case reflect.Ptr:
+			v := reflect.ValueOf(ids[i])
+			if v.IsNil() {
+				return nil, fmt.Errorf("ksql: expected a valid pointer to struct as argument but received a nil pointer: %v", ids[i])
+			}
+
+			fallthrough
 		case reflect.Struct:
 			m, err := kstructs.StructToMap(ids[i])
 			if err != nil {

ksql_test.go

@@ -1018,6 +1018,18 @@ func TestDelete(t *testing.T) {
 				assert.Equal(t, 1, len(results))
 				assert.Equal(t, "This won't be deleted", results[0].Name)
 			})
+
+			t.Run("should report error if it receives a nil pointer to a struct", func(t *testing.T) {
+				db, closer := connectDB(t, config)
+				defer closer.Close()
+
+				ctx := context.Background()
+				c := newTestDB(db, config.driver)
+
+				var user *User
+				err := c.Delete(ctx, UsersTable, user)
+				assert.NotEqual(t, nil, err)
+			})
 		})
 	}
 }