diff --git a/src/main/java/org/jabref/gui/JabRefFrame.java b/src/main/java/org/jabref/gui/JabRefFrame.java
index ba86aa068b8..834f7beb325 100644
--- a/src/main/java/org/jabref/gui/JabRefFrame.java
+++ b/src/main/java/org/jabref/gui/JabRefFrame.java
@@ -232,8 +232,8 @@ private void initDragAndDrop() {
             this.getScene().setOnDragEntered(event -> {
                 // It is necessary to setOnDragOver for newly opened tabs
                 // drag'n'drop on tabs covered dnd on tabbedPane, so dnd on tabs should contain all dnds on tabbedPane
-                tabbedPane.lookupAll(".tab").forEach(t -> {
-                    t.setOnDragOver(tabDragEvent -> {
+                tabbedPane.lookupAll(".tab").forEach(tab -> {
+                    tab.setOnDragOver(tabDragEvent -> {
                         if (DragAndDropHelper.hasBibFiles(tabDragEvent.getDragboard())) {
                             tabDragEvent.acceptTransferModes(TransferMode.ANY);
                             if (!tabbedPane.getTabs().contains(dndIndicator)) {
@@ -249,8 +249,8 @@ private void initDragAndDrop() {
                             tabDragEvent.consume();
                         }
                     });
-                    t.setOnDragExited(event1 -> tabbedPane.getTabs().remove(dndIndicator));
-                    t.setOnDragDropped(tabDragEvent -> {
+                    tab.setOnDragExited(event1 -> tabbedPane.getTabs().remove(dndIndicator));
+                    tab.setOnDragDropped(tabDragEvent -> {
                         if (DragAndDropHelper.hasBibFiles(tabDragEvent.getDragboard())) {
                             tabbedPane.getTabs().remove(dndIndicator);
                             List<Path> bibFiles = DragAndDropHelper.getBibFiles(tabDragEvent.getDragboard());
@@ -260,7 +260,7 @@ private void initDragAndDrop() {
                             tabDragEvent.consume();
                         } else {
                             for (Tab libraryTab : tabbedPane.getTabs()) {
-                                if (libraryTab.getId().equals(t.getId()) &&
+                                if (libraryTab.getId().equals(tab.getId()) &&
                                         !tabbedPane.getSelectionModel().getSelectedItem().equals(libraryTab)) {
                                     ((LibraryTab) libraryTab).dropEntry(stateManager.getLocalDragboard().getBibEntries());
                                 }