diff --git a/CHANGELOG.md b/CHANGELOG.md
index 82913b7d8..77a9e06bd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,16 @@ Android ChangeLog
 
 [Migration Guides](https://github.com/urbanairship/android-library/tree/master/documentation/migration)
 
+Version 9.7.2 - August 30, 2019
+===============================
+Fixes an issue where push message could result in duplicate push notifications. Applications that are
+running 9.4.0 - 9.7.1 should update.
+
+Changes
+-------
+- Fixes issue with double processing messages on older devices.
+
+
 Version 9.7.1 - March 14, 2019
 ==============================
 
diff --git a/airship.properties b/airship.properties
index abb59f22c..e5b9ff7d6 100644
--- a/airship.properties
+++ b/airship.properties
@@ -1,5 +1,5 @@
 # Airship Version - major.minor.patch
-version = 9.7.1
+version = 9.7.2
 
 # Airship Version Qualifier beta, release, etc...
 #versionQualifier = beta
diff --git a/urbanairship-core/src/main/java/com/urbanairship/push/PushManager.java b/urbanairship-core/src/main/java/com/urbanairship/push/PushManager.java
index 4c7f813de..96e9aad96 100644
--- a/urbanairship-core/src/main/java/com/urbanairship/push/PushManager.java
+++ b/urbanairship-core/src/main/java/com/urbanairship/push/PushManager.java
@@ -272,6 +272,7 @@ static final class QuietTime {
 
 
     private final Object tagLock = new Object();
+    private final Object uniqueIdLock = new Object();
 
 
     /**
@@ -1186,32 +1187,34 @@ boolean isUniqueCanonicalId(@Nullable String canonicalId) {
             return true;
         }
 
-        JsonList jsonList = null;
-        try {
-            jsonList = JsonValue.parseString(preferenceDataStore.getString(LAST_CANONICAL_IDS_KEY, null)).getList();
-        } catch (JsonException e) {
-            Logger.debug("PushJobHandler - Unable to parse canonical Ids.", e);
-        }
+        synchronized (uniqueIdLock) {
+            JsonList jsonList = null;
+            try {
+                jsonList = JsonValue.parseString(preferenceDataStore.getString(LAST_CANONICAL_IDS_KEY, null)).getList();
+            } catch (JsonException e) {
+                Logger.debug("PushJobHandler - Unable to parse canonical Ids.", e);
+            }
 
-        List<JsonValue> canonicalIds = jsonList == null ? new ArrayList<JsonValue>() : jsonList.getList();
+            List<JsonValue> canonicalIds = jsonList == null ? new ArrayList<JsonValue>() : jsonList.getList();
 
-        // Wrap the canonicalId
-        JsonValue id = JsonValue.wrap(canonicalId);
+            // Wrap the canonicalId
+            JsonValue id = JsonValue.wrap(canonicalId);
 
-        // Check if the list contains the canonicalId
-        if (canonicalIds.contains(id)) {
-            return false;
-        }
+            // Check if the list contains the canonicalId
+            if (canonicalIds.contains(id)) {
+                return false;
+            }
 
-        // Add it
-        canonicalIds.add(id);
-        if (canonicalIds.size() > MAX_CANONICAL_IDS) {
-            canonicalIds = canonicalIds.subList(canonicalIds.size() - MAX_CANONICAL_IDS, canonicalIds.size());
-        }
+            // Add it
+            canonicalIds.add(id);
+            if (canonicalIds.size() > MAX_CANONICAL_IDS) {
+                canonicalIds = canonicalIds.subList(canonicalIds.size() - MAX_CANONICAL_IDS, canonicalIds.size());
+            }
 
-        // Store the new list
-        preferenceDataStore.put(LAST_CANONICAL_IDS_KEY, JsonValue.wrapOpt(canonicalIds).toString());
+            // Store the new list
+            preferenceDataStore.put(LAST_CANONICAL_IDS_KEY, JsonValue.wrapOpt(canonicalIds).toString());
 
-        return true;
+            return true;
+        }
     }
 }
diff --git a/urbanairship-core/src/main/java/com/urbanairship/push/PushService.java b/urbanairship-core/src/main/java/com/urbanairship/push/PushService.java
index f1829cad3..1bae3d3ca 100644
--- a/urbanairship-core/src/main/java/com/urbanairship/push/PushService.java
+++ b/urbanairship-core/src/main/java/com/urbanairship/push/PushService.java
@@ -59,9 +59,6 @@ public void run() {
                     handler.post(new Runnable() {
                         @Override
                         public void run() {
-                            // Process the push
-                            pushRunnable.run();
-
                             pushes--;
                             if (pushes <= 0) {
                                 stopSelf(lastStartId);