diff --git a/.github/Guidelines/Running-UnitTest.md b/.github/Guidelines/Running-UnitTest.md
index 983cb04b..03095162 100644
--- a/.github/Guidelines/Running-UnitTest.md
+++ b/.github/Guidelines/Running-UnitTest.md
@@ -60,6 +60,10 @@ Ignore `LocalDebuggerCommandArgumentsHistory` in `*.vcxproj.user`.
   - Testing takes a long time. DO NOT hurry.
   - When the script finishes, the result is saved to `REPO-ROOT/.github/Scripts/Execute.log`.
   - A temporary file `Execute.log.unfinished` is created during testing. It will be automatically deleted as soon as the testing finishes. If you see this file, it means the testing is not finished yet.
+    - Read `Execute.log.unfinished` every 5 minutes.
+    - If the log is not updated, it is possible that the unit test raised a fatal error and blocked by the system message dialog. You need to:
+      - Kill the unit test process.
+      - You are required to run the unit test with debugger attached. The fatal error will report to the debugger and you can see what happened.
 - When all test cases pass, the last several lines of `Execute.log` should be in the following pattern; otherwise it crashed at the last shown test case:
   - "Passed test files: X/X"
   - "Passed test cases: Y/Y"
diff --git a/.github/Scripts/copilotExecute.ps1 b/.github/Scripts/copilotExecute.ps1
index e14dbd96..4d35d715 100644
--- a/.github/Scripts/copilotExecute.ps1
+++ b/.github/Scripts/copilotExecute.ps1
@@ -47,7 +47,7 @@ $executableName = $Executable + ".exe"
 $solutionFolder = GetSolutionDir
 
 # Find the file with the latest modification time
-if ($Configuration -ne $null) {
+if ($Configuration -eq $null) {
   $latestFile = GetLatestModifiedExecutable $solutionFolder $executableName
 } else {
   $latestFile = GetSpecifiedExecutable $solutionFolder $executableName $Configuration $Platform