diff --git a/facebook-android-wrapper/src/com/facebook/unity/FB.java b/facebook-android-wrapper/src/com/facebook/unity/FB.java
index af919aa49..b55f679cc 100644
--- a/facebook-android-wrapper/src/com/facebook/unity/FB.java
+++ b/facebook-android-wrapper/src/com/facebook/unity/FB.java
@@ -425,7 +425,12 @@ public static String getKeyHash() {
             PackageInfo info = activity.getPackageManager().getPackageInfo(
                     activity.getPackageName(),
                     PackageManager.GET_SIGNATURES);
-            for (Signature signature : info.signatures){
+            // SM-T113 devices running Android OS 4.4.4 / API-19 will sometimes return null
+            Signature[] signatures = info.signatures;
+            if (signatures == null) {
+                return "";
+            }
+            for (Signature signature : signatures){
                 MessageDigest md = MessageDigest.getInstance("SHA");
                 md.update(signature.toByteArray());
                 String keyHash = Base64.encodeToString(md.digest(), Base64.DEFAULT);