diff --git a/src/org/fdroid/fdroid/AppDetails.java b/src/org/fdroid/fdroid/AppDetails.java
index 57f9c3ead..e3dd0e4c3 100644
--- a/src/org/fdroid/fdroid/AppDetails.java
+++ b/src/org/fdroid/fdroid/AppDetails.java
@@ -494,8 +494,10 @@ public class AppDetails extends ListActivity {
         tv = (TextView) findViewById(R.id.license);
         tv.setText(app.license);
 
-        tv = (TextView) findViewById(R.id.categories);
-        tv.setText(app.categories.toString().replaceAll(",",", "));
+        if (app.categories != null) {
+            tv = (TextView) findViewById(R.id.categories);
+            tv.setText(app.categories.toString().replaceAll(",",", "));
+        }
 
         tv = (TextView) infoView.findViewById(R.id.description);