diff --git a/table/table.gd b/table/table.gd
index e1360a8..4bec1b3 100644
--- a/table/table.gd
+++ b/table/table.gd
@@ -80,8 +80,7 @@ func selector_up():
     var rows_count: = get_rows_count()
     if not (i_rows.size() and (rows_count > 1)):
         return
-    var i_row = i_rows[0]
-    i_row -= 1
+    var i_row = i_rows[0] - 1
     if i_row < 0:
         i_row = rows_count - 1
     set_row_selected(i_row, true)
@@ -100,8 +99,7 @@ func selector_down():
     var rows_count: = get_rows_count()
     if not (i_rows.size() and (rows_count > 1)):
         return
-    var i_row = i_rows[0]
-    i_row += 1
+    var i_row = i_rows[0] + 1
     i_row %= rows_count
     set_row_selected(i_row, true)
     var node = get_node2(0, i_row)
@@ -129,14 +127,18 @@ func set_columns_alignments(alignments: Array):
 
 ##
 func load_selector_scene(file_name: String):
+    _assert(ResourceLoader.exists(file_name), '\"%s\" не найден' % file_name)
     selector_type_file = file_name
     ScnSelector = load(file_name)
+    _assert(ScnSelector is PackedScene, '\"%s\" не PackedScene' % ScnSelector)
 
 
 ##
 func load_node_scene(file_name: String):
+    _assert(ResourceLoader.exists(file_name), '\"%s\" не найден' % file_name)
     node_type_file = file_name
     ScnNode = load(file_name)
+    _assert(ScnNode is PackedScene, '\"%s\" не PackedScene' % ScnNode)
 
 
 ##