diff --git a/RELEASENOTES.md b/RELEASENOTES.md
index b645cc81a0..13218f073f 100644
--- a/RELEASENOTES.md
+++ b/RELEASENOTES.md
@@ -53,6 +53,9 @@
     ([#3303](https://github.com/google/ExoPlayer/issues/3303)).
   * Ignore seeks if an ad is playing
     ([#3309](https://github.com/google/ExoPlayer/issues/3309)).
+  * Improve robustness of `ImaAdsLoader` in case content is not paused between
+    content to ad transitions
+    ([#3430](https://github.com/google/ExoPlayer/issues/3430)).
 * UI:
   * Allow specifying a `Drawable` for the `TimeBar` scrubber
     ([#3337](https://github.com/google/ExoPlayer/issues/3337)).
diff --git a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java
index 0b11a97f84..5b61db0264 100644
--- a/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java
+++ b/extensions/ima/src/main/java/com/google/android/exoplayer2/ext/ima/ImaAdsLoader.java
@@ -260,7 +260,7 @@ public final class ImaAdsLoader extends Player.DefaultEventListener implements A
   @Override
   public void detachPlayer() {
     if (adsManager != null && imaPausedContent) {
-      adPlaybackState.setAdResumePositionUs(C.msToUs(player.getCurrentPosition()));
+      adPlaybackState.setAdResumePositionUs(playingAd ? C.msToUs(player.getCurrentPosition()) : 0);
       adsManager.pause();
     }
     lastAdProgress = getAdProgress();
@@ -628,7 +628,6 @@ public final class ImaAdsLoader extends Player.DefaultEventListener implements A
       if (!wasPlayingAd && playingAd) {
         int adGroupIndex = player.getCurrentAdGroupIndex();
         // IMA hasn't sent CONTENT_PAUSE_REQUESTED yet, so fake the content position.
-        Assertions.checkState(fakeContentProgressElapsedRealtimeMs == C.TIME_UNSET);
         fakeContentProgressElapsedRealtimeMs = SystemClock.elapsedRealtime();
         fakeContentProgressOffsetMs = C.usToMs(adPlaybackState.adGroupTimesUs[adGroupIndex]);
         if (fakeContentProgressOffsetMs == C.TIME_END_OF_SOURCE) {