Unable to select Strict Selector and getting “Object reference not set…” in UiPath Studio 2025.10.6 LTS

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1

Hi @UiPath_Community

I am facing an issue in UiPath Studio 2025.10.6 LTS while configuring a target in modern UI automation.

Issue

  • When I indicate the target element, I am not able to select the Strict selector

  • The option is shown, but clicking it does not enable it

  • If I click Confirm without selecting Strict selector, Studio throws:

Object reference not set to an instance of an object

What makes this strange

  • We are automating the same application as before

  • This issue was not present in the older Studio version

  • It is happening at the time of selector/target configuration itself

Log analysis

From the Studio logs, the exception is coming from the UiPath Studio design layer, not from the target application itself.

Relevant entries point to:

  • UiPath.Shared.Recorder.Design.Windows.ElementEditorWindow.EnsureMaxHeight()

  • UiPath.Shared.Recorder.Design.Windows.ElementEditorWindow.ElementEditorWindowSizeChanged(…)

This makes it look like the error is happening inside the Element Editor / target selection window when the panel is being resized or rendered, rather than during actual runtime automation.

So based on the logs, it seems more like:

  • a Studio UI bug / null reference issue

  • or a problem triggered by the target editor when Strict selector is not getting initialized properly

  • possibly related to the combination of Fuzzy selector + Computer Vision + target editor window state

Environment

  • UiPath Studio: 2025.10.6 LTS

  • Modern UI automation

  • Computer Vision enabled

  • Fuzzy selector appears available

  • Strict selector is visible but cannot be selected

My understanding so far

Because the stack trace points to UiPath.Shared.Recorder.Design.Windows.ElementEditorWindow, this does not look like an application selector issue, but more like a Studio-side problem in the selector editor.

Questions

  1. Is this a known issue in 2025.10.6 LTS?

  2. Has anyone seen Strict selector become unclickable in the target editor?

Any suggestions would be really helpful.

Thanks in advance.

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2

hello @Dhruba_Jyoti_Kalita

you can try this one Disable Computer Vision in Project Settings → UI Automation Modern, then re-indicate
Update UiPath.UIAutomation.Activities to the latest 25.10.x version
Resize the Element Editor window before clicking Strict selector (the crash is tied to window sizing)
Check display scaling— set to 100% if you’re on 125%/150%
Re-indicate on a fresh activity (delete and re-add the activity)
Check F3 wasn’t pressed during indication — Image Region mode disables Strict selector by design

3

hii @Dhruba_Jyoti_Kalita,

re-indicate the element after disabling it
This often fixes the Strict selector issue

Home → Settings → Reset Settings
Fixes UI rendering bugs like this
or Try in a new project

use Properties panel instead of the selector window

4

@shrikrushna.bhoi after updating all the packages, it is working now