Error: 500

Hi

I noticed that activating the joomla debug, pressing the new button table I recive this is error:

500 - Si è verificato un errore.

JDatabaseMySQL::query: 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 SQL=SHOW COLUMNS FROM

Call stack
# Function Location
1 JAdministrator->dispatch() /administrator/index.php:67
2 JComponentHelper->renderComponent() /administrator/includes/application.php:136
3 require_once() /libraries/joomla/application/component/helper.php:162
4 JController->execute() /administrator/components/com_grid/admin.grid.php:24
5 GridsController->edit() /libraries/joomla/application/component/controller.php:236
6 GridsController->display() /administrator/components/com_grid/controller.php:45
7 JController->display() /administrator/components/com_grid/controller.php:37
8 /libraries/joomla/application/component/controller.php:310
9 JView->get() /administrator/components/com_grid/views/grid/view.html.php:30
10 GridsModelGrid->getColList() /libraries/joomla/application/component/view.php:364
11 JDatabaseMySQL->loadResultArray() /administrator/components/com_grid/models/grid.php:187
12 JDatabaseMySQL->query() /libraries/joomla/database/database/mysql.php:373
13 JError->raiseError() /libraries/joomla/database/database/mysql.php:231
14 JError->raise() /libraries/joomla/error/error.php:171
15 JException->__construct() /libraries/joomla/error/error.php:136

Sorry, I have not explained well.
The error appears in the button new of your component grid (not in the editor), when I create a new grid, but only in joomla debug mode.

yes the error appears only in joomla debug mode, without debug I can create the grid view.
Note: in debug mode I can also modify the grid, only I can't create a new.