diff --git a/lib/Core/EpisodeAction/EpisodeActionReader.php b/lib/Core/EpisodeAction/EpisodeActionReader.php
index 4a2efef..6ef5182 100644
--- a/lib/Core/EpisodeAction/EpisodeActionReader.php
+++ b/lib/Core/EpisodeAction/EpisodeActionReader.php
@@ -3,19 +3,22 @@ declare(strict_types=1);
 
 namespace OCA\GPodderSync\Core\EpisodeAction;
 
+use InvalidArgumentException;
+
 class EpisodeActionReader {
 	private array $requiredProperties = ['podcast', 'episode', 'action', 'timestamp'];
 
 	/**
 	 * @param array $episodeActionsArray []
 	 * @return EpisodeAction[]
+	 * @throws InvalidArgumentException
 	 */
 	public function fromArray(array $episodeActionsArray): array {
 		$episodeActions = [];
 
 		foreach ($episodeActionsArray as $episodeAction) {
 			if ($this->hasRequiredProperties($episodeAction) === false) {
-				continue;
+				throw new InvalidArgumentException(sprintf('Client sent incomplete or invalid data: %s', json_encode($episodeAction, JSON_THROW_ON_ERROR)));
 			}
 			$episodeActions[] = new EpisodeAction(
 				$episodeAction["podcast"],
diff --git a/tests/Integration/Controller/EpisodeActionControllerTest.php b/tests/Integration/Controller/EpisodeActionControllerTest.php
index da7fb02..9cb6070 100644
--- a/tests/Integration/Controller/EpisodeActionControllerTest.php
+++ b/tests/Integration/Controller/EpisodeActionControllerTest.php
@@ -100,15 +100,6 @@ class EpisodeActionControllerTest extends TestCase
    "started": 15,
    "position": 120,
    "total":  500
-  },
-  {
-   "podcast": "https://example.org/podcast.php",
-   "episode": "https://example.com/files/foo-bar-123.mp3",
-   "guid": "foo-bar-123",
-   "timestamp": "2009-12-12T09:05:21",
-   "started": -1,
-   "position": -1,
-   "total":  -1
   }
 ]', true, 512, JSON_THROW_ON_ERROR);
 		$request = new Request([], new SecureRandom(), $this->getMockBuilder(IConfig::class)->getMock());
diff --git a/tests/Unit/Core/EpisodeAction/EpisodeActionReaderTest.php b/tests/Unit/Core/EpisodeAction/EpisodeActionReaderTest.php
index 0774c6d..d1b54df 100644
--- a/tests/Unit/Core/EpisodeAction/EpisodeActionReaderTest.php
+++ b/tests/Unit/Core/EpisodeAction/EpisodeActionReaderTest.php
@@ -57,11 +57,12 @@ class EpisodeActionReaderTest extends TestCase {
 	}
 
 	public function testCreateWithFaultyData(): void {
-		$episodeActions = (new EpisodeActionReader())->fromArray([
+		$this->expectException(\InvalidArgumentException::class);
+		$this->expectExceptionMessage('Client sent incomplete or invalid data: {"podcast":"https:\/\/example.org\/feed.xml","action":"download","timestamp":"2021-10-03T12:03:17"}');
+		(new EpisodeActionReader())->fromArray([
 			["podcast" => "https://example.org/feed.xml", "action" => "download", "timestamp" => "2021-10-03T12:03:17"],
 			["podcast" => "https://example.org/feed.xml", "episode" => "https://example.org/episode2.mp3", "guid" => "episode2", "action" => "download", "timestamp" => "2021-10-03T12:03:17"],
 		]);
-		$this->assertCount(1, $episodeActions);
 	}
 
 }