diff --git a/app/src/main/java/eu/faircode/email/ServiceSynchronize.java b/app/src/main/java/eu/faircode/email/ServiceSynchronize.java
index b85a680a2f..304bd8686f 100644
--- a/app/src/main/java/eu/faircode/email/ServiceSynchronize.java
+++ b/app/src/main/java/eu/faircode/email/ServiceSynchronize.java
@@ -151,7 +151,7 @@ public class ServiceSynchronize extends LifecycleService {
             @Override
             public void onChanged(Integer count) {
                 Log.i("Synchronizing folders=" + count);
-                if (count == 0)
+                if (count == null || count == 0)
                     cowner.start();
                 else
                     cowner.stop();