Merge "Readd missing null check"
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index 73bf3dc..47003fa8 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -2112,6 +2112,9 @@
             boolean wallpaperOnly, boolean includeDecor) {
         Bitmap bitmap = screenshotApplications(appToken, width, height, includeFullDisplay,
                 frameScale, wallpaperOnly, includeDecor, SurfaceControl::screenshot);
+        if (bitmap == null) {
+            return null;
+        }
 
         if (DEBUG_SCREENSHOT) {
             // TEST IF IT's ALL BLACK