diff --git a/platform/external-system-impl/src/com/intellij/openapi/externalSystem/service/project/trusted/ExternalSystemTrustedProjectDialog.kt b/platform/external-system-impl/src/com/intellij/openapi/externalSystem/service/project/trusted/ExternalSystemTrustedProjectDialog.kt
index 10b0d4bcb2d4..9fe3637d41a0 100644
--- a/platform/external-system-impl/src/com/intellij/openapi/externalSystem/service/project/trusted/ExternalSystemTrustedProjectDialog.kt
+++ b/platform/external-system-impl/src/com/intellij/openapi/externalSystem/service/project/trusted/ExternalSystemTrustedProjectDialog.kt
@@ -18,7 +18,7 @@ object ExternalSystemTrustedProjectDialog {
     return TrustedProjectsDialog.confirmOpeningOrLinkingUntrustedProject(
       projectRoot,
       project,
-      title = IdeBundle.message("untrusted.project.link.dialog.title", systemId.readableName, projectRoot.fileName),
+      title = IdeBundle.message("untrusted.project.link.dialog.title", systemId.readableName, projectRoot.fileName ?: projectRoot.toString()),
       cancelButtonText = IdeBundle.message("untrusted.project.link.dialog.cancel.button"))
   }
 
diff --git a/platform/platform-impl/src/com/intellij/ide/trustedProjects/TrustedProjectStartupDialog.kt b/platform/platform-impl/src/com/intellij/ide/trustedProjects/TrustedProjectStartupDialog.kt
index 98f8dde6de42..dffae7c5c7c1 100644
--- a/platform/platform-impl/src/com/intellij/ide/trustedProjects/TrustedProjectStartupDialog.kt
+++ b/platform/platform-impl/src/com/intellij/ide/trustedProjects/TrustedProjectStartupDialog.kt
@@ -135,33 +135,38 @@ internal class TrustedProjectStartupDialog(
           row {
             text(message)
           }
-          row {
-            val trimmedFolderName =  StringUtil.shortenTextWithEllipsis(projectPath.parent.name, 40, 0, true)
-            checkBox(IdeBundle.message("untrusted.project.warning.trust.location.checkbox", trimmedFolderName))
-              .bindSelected(trustAll)
-              .apply {
-                component.toolTipText = null
-                component.addMouseMotionListener(TooltipMouseAdapter { listOf(getParentFolder().pathString) })
-              }
-              .onChanged {
-                if (it.isSelected) {
-                  windowsDefender.set(false)
+          if (getParentFolder() != null) {
+            row {
+              val trimmedFolderName = StringUtil.shortenTextWithEllipsis(getParentFolder()!!.name, 40, 0, true)
+              checkBox(IdeBundle.message("untrusted.project.warning.trust.location.checkbox", trimmedFolderName))
+                .bindSelected(trustAll)
+                .apply {
+                  component.toolTipText = null
+                  component.addMouseMotionListener(TooltipMouseAdapter { listOf(getParentFolder()!!.pathString) })
                 }
+                .onChanged {
+                  if (it.isSelected) {
+                    windowsDefender.set(false)
+                  }
 
-                if (trustAction != null) {
-                  val trustButton = getButton(trustAction!!)
-                  val text = if (it.isSelected) {
-                    val truncatedParentFolderName = StringUtil.shortenTextWithEllipsis(getTrustFolder(it.isSelected).name, 18, 0, true)
-                    IdeBundle.message("untrusted.project.dialog.trust.folder.button", truncatedParentFolderName)
-                  } else trustButtonText
-                  trustButton?.text = text
+                  if (trustAction != null) {
+                    val trustButton = getButton(trustAction!!)
+                    val text = if (it.isSelected) {
+                      val truncatedParentFolderName = StringUtil.shortenTextWithEllipsis(getTrustFolder(it.isSelected).name, 18, 0, true)
+                      IdeBundle.message("untrusted.project.dialog.trust.folder.button", truncatedParentFolderName)
+                    }
+                    else trustButtonText
+                    trustButton?.text = text
+                  }
+                  val trimmedFolderName = StringUtil.shortenTextWithEllipsis(getTrustFolder(it.isSelected).name, 18, 0, true)
+                  windowsDefenderCheckBox?.component?.text = IdeBundle.message("untrusted.project.windows.defender.trust.location.checkbox", trimmedFolderName)
                 }
-                val trimmedFolderName = StringUtil.shortenTextWithEllipsis(getTrustFolder(it.isSelected).name, 18, 0, true)
-                windowsDefenderCheckBox?.component?.text = IdeBundle.message("untrusted.project.windows.defender.trust.location.checkbox", trimmedFolderName)
-              }
+            }
           }
           row {
-            val trimmedFolderName = StringUtil.shortenTextWithEllipsis(projectPath.name, 18, 0, true)
+            val trimmedFolderName = StringUtil.shortenTextWithEllipsis(projectPath.name.ifEmpty { projectPath.toString() }
+
+                                                                       , 18, 0, true)
             val idePaths = pathsToExclude.asSequence().filter { it != projectPath }.joinToString(separator = "<br>")
             windowsDefenderCheckBox = checkBox(IdeBundle.message("untrusted.project.windows.defender.trust.location.checkbox", trimmedFolderName))
               .bindSelected(windowsDefender)
@@ -212,9 +217,9 @@ internal class TrustedProjectStartupDialog(
     }
   }
 
-  private fun getTrustFolder(isTrustAll: Boolean): Path = if (isTrustAll) getParentFolder() else projectPath
+  private fun getTrustFolder(isTrustAll: Boolean): Path = if (isTrustAll) getParentFolder() ?: projectPath else projectPath
 
-  private fun getParentFolder(): Path = projectPath.parent
+  private fun getParentFolder(): Path? = projectPath.parent
 
   override fun createActions(): Array<out Action?> {
     val actions: MutableList<Action> = mutableListOf()
diff --git a/platform/platform-impl/src/com/intellij/openapi/project/impl/ProjectManagerImpl.kt b/platform/platform-impl/src/com/intellij/openapi/project/impl/ProjectManagerImpl.kt
index f35d05f4fa34..8355c5f4655b 100644
--- a/platform/platform-impl/src/com/intellij/openapi/project/impl/ProjectManagerImpl.kt
+++ b/platform/platform-impl/src/com/intellij/openapi/project/impl/ProjectManagerImpl.kt
@@ -1487,7 +1487,7 @@ private suspend fun checkTrustedState(projectStoreBaseDir: Path): Boolean {
   return confirmOpeningOrLinkingUntrustedProject(
     projectRoot = projectStoreBaseDir,
     project = null,
-    title = IdeBundle.message("untrusted.project.open.dialog.title", projectStoreBaseDir.fileName)
+    title = IdeBundle.message("untrusted.project.open.dialog.title", projectStoreBaseDir.fileName ?: projectStoreBaseDir.toString())
   )
 }