diff --git a/lib/BigBlueButton/API.php b/lib/BigBlueButton/API.php
index cb1e008..1ddae0e 100644
--- a/lib/BigBlueButton/API.php
+++ b/lib/BigBlueButton/API.php
@@ -94,7 +94,7 @@ class API {
 	/**
 	 * Create meeting room.
 	 *
-	 * @return int creation time
+	 * @return float|int creation time
 	 */
 	public function createMeeting(Room $room, Presentation $presentation = null) {
 		$bbb = $this->getServer();
@@ -145,6 +145,7 @@ class API {
 		}
 
 		if ($presentation !== null && $presentation->isValid()) {
+			/** @psalm-suppress InvalidArgument */
 			$createMeetingParams->addPresentation($presentation->getUrl(), null, $presentation->getFilename());
 		}
 
diff --git a/lib/Crypto.php b/lib/Crypto.php
index 5e2213b..a7d0a99 100644
--- a/lib/Crypto.php
+++ b/lib/Crypto.php
@@ -14,7 +14,10 @@ class Crypto {
 		$this->crypto = $crypto;
 	}
 
-	public function calculateHMAC(string $message): string {
+	/**
+	 * @return false|string
+	 */
+	public function calculateHMAC(string $message) {
 		if ($message === null) {
 			throw new \InvalidArgumentException();
 		}
diff --git a/tests/psalm-baseline.xml b/tests/psalm-baseline.xml
index eddd964..1c8a2c2 100644
--- a/tests/psalm-baseline.xml
+++ b/tests/psalm-baseline.xml
@@ -7,26 +7,6 @@
       <code>\OCA\Circles\Model\Member</code>
     </UndefinedClass>
   </file>
-  <file src="lib/Controller/RoomController.php">
-    <NullArgument occurrences="1">
-      <code>null</code>
-    </NullArgument>
-  </file>
-  <file src="lib/Controller/ServerController.php">
-    <InvalidArgument occurrences="1">
-      <code>$success</code>
-    </InvalidArgument>
-  </file>
-  <file src="lib/NoPermissionResponse.php">
-    <MissingDependency occurrences="1">
-      <code>Template</code>
-    </MissingDependency>
-  </file>
-  <file src="lib/NotFoundResponse.php">
-    <MissingDependency occurrences="1">
-      <code>Template</code>
-    </MissingDependency>
-  </file>
   <file src="lib/Service/RestrictionService.php">
     <InvalidReturnType occurrences="3">
       <code>Restriction</code>