diff --git a/quickstep/src/com/android/launcher3/statehandlers/DesktopVisibilityController.kt b/quickstep/src/com/android/launcher3/statehandlers/DesktopVisibilityController.kt
index 3773d02..37e8d4d 100644
--- a/quickstep/src/com/android/launcher3/statehandlers/DesktopVisibilityController.kt
+++ b/quickstep/src/com/android/launcher3/statehandlers/DesktopVisibilityController.kt
@@ -18,6 +18,7 @@
 import android.content.Context
 import android.os.Debug
 import android.util.Log
+import android.util.Slog
 import android.util.SparseArray
 import android.view.Display.DEFAULT_DISPLAY
 import android.window.DesktopModeFlags.ENABLE_DESKTOP_WINDOWING_WALLPAPER_ACTIVITY
@@ -152,7 +153,8 @@
             return areDesktopTasksVisible()
         }
 
-        val isInDesktopMode = displaysDesksConfigsMap[displayId].activeDeskId != INACTIVE_DESK_ID
+        val activeDeskId = getDisplayDeskConfig(displayId)?.activeDeskId ?: INACTIVE_DESK_ID
+        val isInDesktopMode = activeDeskId != INACTIVE_DESK_ID
         if (DEBUG) {
             Log.d(TAG, "isInDesktopMode: $isInDesktopMode")
         }
@@ -409,18 +411,16 @@
         }
     }
 
-    private fun getDisplayDeskConfig(displayId: Int): DisplayDeskConfig {
-        return checkNotNull(displaysDesksConfigsMap[displayId]) {
-            "Expected non-null desk config for display: $displayId"
-        }
-    }
+    private fun getDisplayDeskConfig(displayId: Int) =
+        displaysDesksConfigsMap[displayId]
+            ?: null.also { Slog.e(TAG, "Expected non-null desk config for display: $displayId") }
 
     private fun onCanCreateDesksChanged(displayId: Int, canCreateDesks: Boolean) {
         if (!DesktopModeStatus.enableMultipleDesktops(context)) {
             return
         }
 
-        getDisplayDeskConfig(displayId).canCreateDesks = canCreateDesks
+        getDisplayDeskConfig(displayId)?.canCreateDesks = canCreateDesks
     }
 
     private fun onDeskAdded(displayId: Int, deskId: Int) {
@@ -428,7 +428,7 @@
             return
         }
 
-        getDisplayDeskConfig(displayId).also {
+        getDisplayDeskConfig(displayId)?.also {
             check(it.deskIds.add(deskId)) {
                 "Found a duplicate desk Id: $deskId on display: $displayId"
             }
@@ -440,7 +440,7 @@
             return
         }
 
-        getDisplayDeskConfig(displayId).also {
+        getDisplayDeskConfig(displayId)?.also {
             check(it.deskIds.remove(deskId)) {
                 "Removing non-existing desk Id: $deskId on display: $displayId"
             }
@@ -457,7 +457,7 @@
 
         val wasInDesktopMode = isInDesktopModeAndNotInOverview(displayId)
 
-        getDisplayDeskConfig(displayId).also {
+        getDisplayDeskConfig(displayId)?.also {
             check(oldActiveDesk == it.activeDeskId) {
                 "Mismatch between the Shell's oldActiveDesk: $oldActiveDesk, and Launcher's: ${it.activeDeskId}"
             }
diff --git a/quickstep/tests/src/com/android/launcher3/statehandlers/DesktopVisibilityControllerTest.kt b/quickstep/tests/src/com/android/launcher3/statehandlers/DesktopVisibilityControllerTest.kt
new file mode 100644
index 0000000..4b8f2a2
--- /dev/null
+++ b/quickstep/tests/src/com/android/launcher3/statehandlers/DesktopVisibilityControllerTest.kt
@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2025 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.launcher3.statehandlers
+
+import android.content.Context
+import android.platform.test.annotations.EnableFlags
+import android.platform.test.flag.junit.SetFlagsRule
+import androidx.test.ext.junit.runners.AndroidJUnit4
+import androidx.test.filters.SmallTest
+import com.android.dx.mockito.inline.extended.ExtendedMockito.mockitoSession
+import com.android.launcher3.util.DaggerSingletonTracker
+import com.android.quickstep.SystemUiProxy
+import com.android.window.flags.Flags.FLAG_ENABLE_MULTIPLE_DESKTOPS_BACKEND
+import com.android.window.flags.Flags.FLAG_ENABLE_MULTIPLE_DESKTOPS_FRONTEND
+import com.android.wm.shell.shared.desktopmode.DesktopModeStatus
+import org.junit.After
+import org.junit.Assert.assertFalse
+import org.junit.Before
+import org.junit.Rule
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.mockito.kotlin.mock
+import org.mockito.kotlin.whenever
+import org.mockito.quality.Strictness
+
+/**
+ * Tests the behavior of [DesktopVisibilityController] in regards to multiple desktops and multiple
+ * displays.
+ */
+@SmallTest
+@RunWith(AndroidJUnit4::class)
+class DesktopVisibilityControllerTest {
+
+    @get:Rule val setFlagsRule = SetFlagsRule()
+
+    private val mockitoSession =
+        mockitoSession()
+            .strictness(Strictness.LENIENT)
+            .mockStatic(DesktopModeStatus::class.java)
+            .startMocking()
+
+    private val context = mock<Context>()
+    private val systemUiProxy = mock<SystemUiProxy>()
+    private val lifeCycleTracker = mock<DaggerSingletonTracker>()
+    private lateinit var desktopVisibilityController: DesktopVisibilityController
+
+    @Before
+    fun setUp() {
+        whenever(context.resources).thenReturn(mock())
+        whenever(DesktopModeStatus.enableMultipleDesktops(context)).thenReturn(true)
+        desktopVisibilityController =
+            DesktopVisibilityController(context, systemUiProxy, lifeCycleTracker)
+    }
+
+    @After
+    fun tearDown() {
+        mockitoSession.finishMocking()
+    }
+
+    @Test
+    @EnableFlags(FLAG_ENABLE_MULTIPLE_DESKTOPS_BACKEND, FLAG_ENABLE_MULTIPLE_DESKTOPS_FRONTEND)
+    fun noCrashWhenCheckingNonExistentDisplay() {
+        assertFalse(desktopVisibilityController.isInDesktopMode(displayId = 500))
+        assertFalse(desktopVisibilityController.isInDesktopModeAndNotInOverview(displayId = 300))
+    }
+}