diff --git a/iNaturalist/src/main/AndroidManifest.xml b/iNaturalist/src/main/AndroidManifest.xml
index f3ba53002..3e7a1c8fb 100644
--- a/iNaturalist/src/main/AndroidManifest.xml
+++ b/iNaturalist/src/main/AndroidManifest.xml
@@ -3,8 +3,8 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="org.inaturalist.android"
     android:installLocation="auto"
-    android:versionCode="596"
-    android:versionName="1.30.3">
+    android:versionCode="597"
+    android:versionName="1.30.4">
 
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
diff --git a/iNaturalist/src/main/java/org/inaturalist/android/ObservationViewerFragment.java b/iNaturalist/src/main/java/org/inaturalist/android/ObservationViewerFragment.java
index 7500da4d5..e9409f764 100644
--- a/iNaturalist/src/main/java/org/inaturalist/android/ObservationViewerFragment.java
+++ b/iNaturalist/src/main/java/org/inaturalist/android/ObservationViewerFragment.java
@@ -462,7 +462,8 @@ public Object instantiateItem(ViewGroup container, final int position) {
 
                     if (mObsJson != null) {
                         try {
-                            BetterJSONObject obsSound = new BetterJSONObject(new JSONObject(mObsJson).getJSONArray("observation_sounds").getJSONObject(position - mObservation.photos.size()));
+                            int obsPhotoCount = mObservation.photos != null ? mObservation.photos.size() : 0;
+                            BetterJSONObject obsSound = new BetterJSONObject(new JSONObject(mObsJson).getJSONArray("observation_sounds").getJSONObject(position - obsPhotoCount));
                             item = new BetterJSONObject(obsSound.getJSONObject("sound"));
                             isHidden = new ObservationSound(obsSound).hidden;
                         } catch (JSONException e) {