Make Sessions resilient to the FirebaseApp instance being deleted

firebase-crashlytics/src/main/java/com/google/firebase/crashlytics/internal/common/DataCollectionArbiter.java

@@ -75,11 +75,24 @@ public synchronized boolean isAutomaticDataCollectionEnabled() {
     final boolean dataCollectionEnabled =
         crashlyticsDataCollectionEnabled != null
             ? crashlyticsDataCollectionEnabled
-            : firebaseApp.isDataCollectionDefaultEnabled();
+            : isFirebaseDataCollectionDefaultEnabled();
     logDataCollectionState(dataCollectionEnabled);
     return dataCollectionEnabled;
   }
 
+  /**
+   * Determine whether automatic data collection is enabled or disabled by default in all SDKs.
+   *
+   * <p>If the FirebaseApp has been deleted, returns false.
+   */
+  private boolean isFirebaseDataCollectionDefaultEnabled() {
+    try {
+      return firebaseApp.isDataCollectionDefaultEnabled();
+    } catch (IllegalStateException ignored) {
+      return false;
+    }
+  }
+
   public synchronized void setCrashlyticsDataCollectionEnabled(@Nullable Boolean enabled) {
     if (enabled != null) {
       setInManifest = false;

firebase-perf/src/main/java/com/google/firebase/perf/FirebasePerformanceInitializer.java

@@ -15,17 +15,26 @@
 package com.google.firebase.perf;
 
 import com.google.firebase.perf.application.AppStateMonitor;
+import com.google.firebase.perf.logging.AndroidLogger;
 
 /**
  * FirebasePerformanceInitializer to initialize FirebasePerformance during app cold start
  *
  * @hide
  */
 public final class FirebasePerformanceInitializer implements AppStateMonitor.AppColdStartCallback {
+  private static final AndroidLogger logger = AndroidLogger.getInstance();
 
   @Override
   public void onAppColdStart() {
     // Initialize FirebasePerformance when app cold starts.
-    FirebasePerformance.getInstance();
+    try {
+      FirebasePerformance.getInstance();
+    } catch (IllegalStateException ex) {
+      logger.info(
+          "FirebaseApp is not initialized. Firebase Performance will not be collecting any "
+              + "performance metrics until initialized. %s",
+          ex);
+    }
   }
 }

firebase-sessions/CHANGELOG.md

@@ -1,5 +1,9 @@
 # Unreleased
 
+* [fixed] Made Sessions more resilient to the FirebaseApp instance being deleted.
+
+# 1.0.1
+
 * [fixed] Fixed NPE when no version name is
   set ([#5195](//github.com/firebase/firebase-android-sdk/issues/5195)).
 * [fixed] Populate DataCollectionStatus fields for Crashlytics and Perf.

firebase-sessions/src/main/kotlin/com/google/firebase/sessions/FirebaseSessions.kt

@@ -75,6 +75,11 @@ internal constructor(
     val appContext = firebaseApp.applicationContext.applicationContext
     if (appContext is Application) {
       appContext.registerActivityLifecycleCallbacks(sessionInitiator.activityLifecycleCallbacks)
+
+      firebaseApp.addLifecycleEventListener { _, _ ->
+        Log.w(TAG, "FirebaseApp instance deleted. Sessions library will not collect session data.")
+        appContext.unregisterActivityLifecycleCallbacks(sessionInitiator.activityLifecycleCallbacks)
+      }
     } else {
       Log.e(
         TAG,
@@ -138,9 +143,18 @@ internal constructor(
       return
     }
 
-    sessionCoordinator.attemptLoggingSessionEvent(
-      SessionEvents.startSession(firebaseApp, sessionDetails, sessionSettings, subscribers)
-    )
+    try {
+      val sessionEvent =
+        SessionEvents.startSession(firebaseApp, sessionDetails, sessionSettings, subscribers)
+      sessionCoordinator.attemptLoggingSessionEvent(sessionEvent)
+    } catch (ex: IllegalStateException) {
+      // This can happen if the app suddenly deletes the instance of FirebaseApp.
+      Log.i(
+        TAG,
+        "FirebaseApp is not initialized. Sessions library will not collect session data.",
+        ex
+      )
+    }
   }
 
   /** Calculate whether we should sample events using [sessionSettings] data. */