diff --git a/jablib/src/main/java/org/jabref/logic/importer/fetcher/DoiFetcher.java b/jablib/src/main/java/org/jabref/logic/importer/fetcher/DoiFetcher.java
index 17cb4de7a37..9a335778552 100644
--- a/jablib/src/main/java/org/jabref/logic/importer/fetcher/DoiFetcher.java
+++ b/jablib/src/main/java/org/jabref/logic/importer/fetcher/DoiFetcher.java
@@ -149,7 +149,8 @@ public Optional<BibEntry> performSearchById(String identifier) throws FetcherExc
             bibtexString = URLDownload.asString(openConnection).trim();
 
             // BibTeX entry
-            fetchedEntry = BibtexParser.singleFromString(bibtexString, preferences);
+            List<BibEntry> entries = new BibtexParser(preferences).parseEntries(bibtexString);
+            fetchedEntry = entries.isEmpty() ? Optional.empty() : Optional.of(entries.getFirst());
             fetchedEntry.ifPresent(this::doPostCleanup);
 
             // Crossref has a dynamic API rate limit
diff --git a/jablib/src/main/java/org/jabref/logic/net/URLDownload.java b/jablib/src/main/java/org/jabref/logic/net/URLDownload.java
index 1339fd975ac..f545feb325b 100644
--- a/jablib/src/main/java/org/jabref/logic/net/URLDownload.java
+++ b/jablib/src/main/java/org/jabref/logic/net/URLDownload.java
@@ -232,7 +232,7 @@ public static String asString(URLConnection existingConnection) throws FetcherEx
      * @param connection an existing connection
      * @return the downloaded string
      */
-    public static String asString(Charset encoding, URLConnection connection) throws FetcherException {
+    private static String asString(Charset encoding, URLConnection connection) throws FetcherException {
         try (InputStream input = new BufferedInputStream(connection.getInputStream());
              Writer output = new StringWriter()) {
             copy(input, output, encoding);