diff --git a/src/main/java/org/jabref/JabRefGUI.java b/src/main/java/org/jabref/JabRefGUI.java
index 8e74b97ee30..57214d9ef9f 100644
--- a/src/main/java/org/jabref/JabRefGUI.java
+++ b/src/main/java/org/jabref/JabRefGUI.java
@@ -168,7 +168,7 @@ private void openWindow(Stage mainStage) {
             String message = Localization.lang("Error opening file '%0'.", pr.getFile().get().getName()) + "\n"
                     + pr.getErrorMessage();
 
-            JabRefGUI.mainFrame.getDialogService().showErrorDialogAndWait(Localization.lang("Error opening file"), message);
+            dialogService.showErrorDialogAndWait(Localization.lang("Error opening file"), message);
 
         }
 
diff --git a/src/main/java/org/jabref/gui/logging/GuiAppender.java b/src/main/java/org/jabref/gui/logging/GuiAppender.java
index d6a6f25ebd6..4d5956b94c5 100644
--- a/src/main/java/org/jabref/gui/logging/GuiAppender.java
+++ b/src/main/java/org/jabref/gui/logging/GuiAppender.java
@@ -13,6 +13,7 @@
 import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
 import org.apache.logging.log4j.core.config.plugins.PluginElement;
 import org.apache.logging.log4j.core.config.plugins.PluginFactory;
+import org.apache.logging.log4j.core.impl.MutableLogEvent;
 import org.apache.logging.log4j.core.layout.PatternLayout;
 
 @Plugin(name = "GuiAppender", category = "Core", elementType = "appender", printObject = true)
@@ -44,6 +45,9 @@ public static GuiAppender createAppender(@PluginAttribute("name") String name,
      */
     @Override
     public void append(LogEvent event) {
-        DefaultTaskExecutor.runInJavaFXThread(() -> LogMessages.getInstance().add(event));
+        // We need to make a copy as instances of LogEvent are reused by log4j
+        MutableLogEvent copy = new MutableLogEvent();
+        copy.initFrom(event);
+        DefaultTaskExecutor.runInJavaFXThread(() -> LogMessages.getInstance().add(copy));
     }
 }
diff --git a/src/main/java/org/jabref/logic/logging/LogMessages.java b/src/main/java/org/jabref/logic/logging/LogMessages.java
index 06f10f1c3eb..053252b6e1f 100644
--- a/src/main/java/org/jabref/logic/logging/LogMessages.java
+++ b/src/main/java/org/jabref/logic/logging/LogMessages.java
@@ -4,7 +4,6 @@
 import javafx.collections.ObservableList;
 
 import org.apache.logging.log4j.core.LogEvent;
-import org.apache.logging.log4j.core.impl.MutableLogEvent;
 
 /**
  * This class is used for storing and archiving all message output of JabRef as log events.
@@ -28,10 +27,7 @@ public ObservableList<LogEvent> getMessages() {
     }
 
     public void add(LogEvent event) {
-        // We need to make a copy as instances of LogEvent are reused by log4j
-        MutableLogEvent copy = new MutableLogEvent();
-        copy.initFrom(event);
-        messages.add(copy);
+        messages.add(event);
     }
 
     public void clear() {