diff --git a/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java b/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
index 88fea31..0a83279 100644
--- a/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/TaskbarDragController.java
@@ -36,6 +36,7 @@
 import android.graphics.RectF;
 import android.graphics.drawable.Drawable;
 import android.os.UserHandle;
+import android.util.Log;
 import android.util.Pair;
 import android.view.DragEvent;
 import android.view.MotionEvent;
@@ -87,6 +88,7 @@
  */
 public class TaskbarDragController extends DragController<BaseTaskbarContext> implements
         TaskbarControllers.LoggableTaskbarController {
+    private static final String TAG = "TaskbarDragController";
 
     private static final boolean DEBUG_DRAG_SHADOW_SURFACE = false;
     private static final int ANIM_DURATION_RETURN_ICON_TO_TASKBAR = 300;
@@ -318,12 +320,26 @@
             @Override
             public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {
                 int iconSize = Math.max(mDragIconSize, btv.getWidth());
-                shadowSize.set(iconSize, iconSize);
+                if (iconSize > 0) {
+                    shadowSize.set(iconSize, iconSize);
+                } else {
+                    Log.d(TAG, "Invalid icon size, dragSize=" + mDragIconSize
+                            + " viewWidth=" + btv.getWidth());
+                }
+
                 // The registration point was taken before the icon scaled to mDragIconSize, so
                 // offset the registration to where the touch is on the new size.
                 int offsetX = (mDragIconSize - mDragObject.dragView.getDragRegionWidth()) / 2;
                 int offsetY = (mDragIconSize - mDragObject.dragView.getDragRegionHeight()) / 2;
-                shadowTouchPoint.set(mRegistrationX + offsetX, mRegistrationY + offsetY);
+                int touchX = mRegistrationX + offsetX;
+                int touchY = mRegistrationY + offsetY;
+                if (touchX >= 0 && touchY >= 0) {
+                    shadowTouchPoint.set(touchX, touchY);
+                } else {
+                    Log.d(TAG, "Invalid touch point, "
+                            + "registrationXY=(" + mRegistrationX + ", " + mRegistrationY + ") "
+                            + "offsetXY=(" + offsetX + ", " + offsetY + ")");
+                }
             }
 
             @Override