# \[BUG-13913\] Designer Crash on deleting navigation parameter in Perspective while said parameter has focus **URL:** \ **Category:** Ignition Early Access\ **Created:** [May 15, 2019, 9:08pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044 "2019-05-15T21:08:58Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![jkuhn](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jkuhn/32/8937_2.png) [@jkuhn](https://forum.inductiveautomation.com/u/jkuhn)\ **Post date:** [May 15, 2019, 9:08pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044/1 "2019-05-15T21:08:58Z")
![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/1/177bf34c7653e5833f0b99a53e75ce30ab8f1ce1.png) If your cursor has focus in the parameter Name field and you try to delete the parameter, it seems to lock up the designer. Nothing can be closed. ---
**Author:** ![cmallonee](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/cmallonee/32/6416_2.png) [@cmallonee](https://forum.inductiveautomation.com/u/cmallonee)\ **Post date:** [May 15, 2019, 9:16pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044/2 "2019-05-15T21:16:01Z")
If I only have one parameter and I elect to delete it, I AM able to generate an IndexOutOfBoundsException (not terrible, but we could do better), but I’m not able to crash my Designer. From the looks of the property picker icon, you’re on an older version than I am. What version are you using? ---
**Author:** ![jkuhn](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jkuhn/32/8937_2.png) [@jkuhn](https://forum.inductiveautomation.com/u/jkuhn)\ **Post date:** [May 15, 2019, 9:19pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044/3 "2019-05-15T21:19:23Z")
I updated to the stable 8.01 version shortly before posting this. I was using an early access 8.01 prior. The stable release still had this problem. My designer was still running, but I could not close anything, save, etc. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [May 15, 2019, 9:28pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044/4 "2019-05-15T21:28:50Z")
Close the designer launcher application, if it’s running in the background. There’s an unrelated issue (that’s already been fixed) that causes uncaught exceptions to end up hanging up the running designer. ---
**Author:** ![jkuhn](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jkuhn/32/8937_2.png) [@jkuhn](https://forum.inductiveautomation.com/u/jkuhn)\ **Post date:** [May 15, 2019, 9:53pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044/5 "2019-05-15T21:53:46Z")
Understood. Thanks for the help. ---
**Author:** ![awalker](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/awalker/32/6874_2.png) [@awalker](https://forum.inductiveautomation.com/u/awalker)\ **Post date:** [May 24, 2019, 3:17pm UTC](https://forum.inductiveautomation.com/t/bug-13913-designer-crash-on-deleting-navigation-parameter-in-perspective-while-said-parameter-has-focus/25044/6 "2019-05-24T15:17:16Z")
This issue was fixed in the 8.0.3 nightly build that was uploaded yesterday (5/23).