🐛 Fix abe33#93 Issue

Reference source
abe33#93 (comment)

Author: k-utsumi

lib/table-element.js

@@ -1306,8 +1306,10 @@ class TableElement extends HTMLElement {
     const cursorValue = cursor.getValue()
     this.editor.setText(String(cursorValue || this.getUndefinedDisplay()))
 
-    this.editor.getBuffer().history.clearUndoStack()
-    this.editor.getBuffer().history.clearRedoStack()
+    if (this.editor.getBuffer().history != undefined) {
+      this.editor.getBuffer().history.clearUndoStack()
+      this.editor.getBuffer().history.clearRedoStack()
+    }
 
     if (initialData) { this.editor.setText(initialData) }
   }
@@ -1353,8 +1355,10 @@ class TableElement extends HTMLElement {
       this.editorElement.focus()
       this.editor.setText(this.columnUnderEdit.name != null ? this.columnUnderEdit.name : columnName(columnIndex))
 
-      this.editor.getBuffer().history.clearUndoStack()
-      this.editor.getBuffer().history.clearRedoStack()
+      if (this.editor.getBuffer().history != undefined) {
+        this.editor.getBuffer().history.clearUndoStack()
+        this.editor.getBuffer().history.clearRedoStack()
+      }
     }
   }