# only depending on vtk, no code to call vtk，crash when close
**URL:** https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064
**Category:** Development
**Tags:** code
**Created:** [September 26, 2025, 3:24am UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064 "2025-09-26T03:24:04Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@sophia](https://discourse.vtk.org/u/sophia)
#### Post date: [September 26, 2025, 3:24am UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064/1 "2025-09-26T03:24:04Z")
A mfc application use one dll, the dll depend vtk。Free library when close the app, crash in the vtk code “ delete key;“
void vtkCommonInformationKeyManager::ClassFinalize()
{
…
delete key;
…
}
how to reslove the issue, thanks for reply
---
### Author:  [@Paulo\_Carvalho](https://discourse.vtk.org/u/Paulo_Carvalho)
#### Post date: [September 29, 2025, 6:15pm UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064/2 "2025-09-29T18:15:20Z")
Hello,
It can indeed be some unchecked `delete` that went unnoticed until someone just tried to load the library without actually using it like you. Perhaps you could report the bug here: [https://gitlab.kitware.com/vtk/vtk/-/issues](https://gitlab.kitware.com/vtk/vtk/-/issues) . Other than that, only taking a look at your code.
best,
PC
---
### Author:  [@sophia](https://discourse.vtk.org/u/sophia)
#### Post date: [October 11, 2025, 6:12am UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064/3 "2025-10-11T06:12:58Z")
thanks for your reply。 i have reported the bug，expected to be handled。
---
### Author:  [@dgobbi](https://discourse.vtk.org/u/dgobbi)
#### Post date: [October 12, 2025, 5:23pm UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064/4 "2025-10-12T17:23:48Z")
The `vtkCommonInformationKeyManager` is meant to do cleanup of all VTK information keys when the program exits (that is, every class derived from `vtkInformationKey`).
In order for the cleanup to work correctly, every header file that defines a `vtkInformationKey` subclass must include `vtkCommonInformationKeyManager.h`. For example,
`vtkInformationIntegerKey.h`:
```c++
#include "vtkInformationKey.h"
#include "vtkCommonInformationKeyManager.h" // Manage instances of this type.
VTK_ABI_NAMESPACE_BEGIN
class VTKCOMMONCORE_EXPORT vtkInformationIntegerKey : public vtkInformationKey
{
...
```
The most likely cause of a crash in `vtkCommonInformationKeyManager::ClassFinalize()` is that someone created a custom information key _without_ including `vtkCommonInformationKeyManager.h`. This header ensures proper cleanup via the [nifti counter idiom](https://en.wikibooks.org/wiki/More_C%2B%2B_Idioms/Nifty_Counter), but if it isn’t included wherever a key is defined, it doesn’t work.
Sophia, do you know if your code defines any `vtkInformationKey` subclasses? Also, can you provide a full stack trace for the crash, so that we can better understand what the error was?
---
### Author:  [@sophia](https://discourse.vtk.org/u/sophia)
#### Post date: [January 29, 2026, 3:44am UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064/5 "2026-01-29T03:44:53Z")
the stack is below:
output window is“引发了未经处理的异常:读取访问权限冲突。
e-\>Item-\>\*\*\*\* 是 0x7FFAC6728EC0。”
---
### Author:  [@sophia](https://discourse.vtk.org/u/sophia)
#### Post date: [January 29, 2026, 7:02am UTC](https://discourse.vtk.org/t/only-depending-on-vtk-no-code-to-call-vtk-crash-when-close/16064/6 "2026-01-29T07:02:49Z")
