diff --git a/src/com/android/launcher3/LauncherAppState.java b/src/com/android/launcher3/LauncherAppState.java
index 5e41fca..5cfcf8b 100644
--- a/src/com/android/launcher3/LauncherAppState.java
+++ b/src/com/android/launcher3/LauncherAppState.java
@@ -238,4 +238,8 @@
         return getInstance().mBuildInfo.isDogfoodBuild() &&
                 Launcher.isPropertyEnabled(Launcher.DISABLE_ALL_APPS_PROPERTY);
     }
+
+    public static boolean isDogfoodBuild() {
+        return getInstance().mBuildInfo.isDogfoodBuild();
+    }
 }
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index b6276c0..91c29cb 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -4051,7 +4051,13 @@
             } else {
                 cellLayout = getScreenWithId(mDragInfo.screenId);
             }
-            cellLayout.onDropChild(mDragInfo.cell);
+            if (cellLayout == null && LauncherAppState.isDogfoodBuild()) {
+                throw new RuntimeException("Invalid state: cellLayout == null in "
+                        + "Workspace#onDropCompleted. Please file a bug. ");
+            }
+            if (cellLayout != null) {
+                cellLayout.onDropChild(mDragInfo.cell);
+            }
         }
         if ((d.cancelled || (beingCalledAfterUninstall && !mUninstallSuccessful))
                 && mDragInfo.cell != null) {