Check for cameraInstance == null.

1 files changed, 1 insertions, 1 deletions

diff --git a/zxing-android-embedded/src/com/journeyapps/barcodescanner/CameraPreview.java b/zxing-android-embedded/src/com/journeyapps/barcodescanner/CameraPreview.java
index 377ca568..b303ff82 100644
--- a/zxing-android-embedded/src/com/journeyapps/barcodescanner/CameraPreview.java
+++ b/zxing-android-embedded/src/com/journeyapps/barcodescanner/CameraPreview.java
@@ -657,7 +657,7 @@ public class CameraPreview extends ViewGroup {
 
 
     private void startCameraPreview(CameraSurface surface) {
-        if (!previewActive) {
+        if (!previewActive && cameraInstance != null) {
             Log.i(TAG, "Starting preview");
             cameraInstance.setSurface(surface);
             cameraInstance.startPreview();