Crash when closing a query tab

### Description

HeidiSQL crashes when closing query tabs.

[bugreport.txt](https://github.com/user-attachments/files/21748455/bugreport.txt)

### HeidiSQL version

12.11.0.7011

### Database server version

-

### Reproduction recipe

Open a query tab, close it again using the x without enetering SQL statements.

### Error/Backtrace

```shell

```