diff --git a/app/src/main/java/eu/faircode/email/Core.java b/app/src/main/java/eu/faircode/email/Core.java
index b870f1f446..454d61792d 100644
--- a/app/src/main/java/eu/faircode/email/Core.java
+++ b/app/src/main/java/eu/faircode/email/Core.java
@@ -38,6 +38,8 @@ import androidx.annotation.NonNull;
 import androidx.core.app.NotificationCompat;
 import androidx.preference.PreferenceManager;
 
+import com.bugsnag.android.BreadcrumbType;
+import com.bugsnag.android.Bugsnag;
 import com.sun.mail.iap.CommandFailedException;
 import com.sun.mail.iap.ConnectionException;
 import com.sun.mail.iap.Response;
@@ -144,6 +146,13 @@ class Core {
                             " msg=" + op.message +
                             " args=" + op.args);
 
+                    Map<String, String> crumb = new HashMap<>();
+                    crumb.put("name", op.name);
+                    crumb.put("args", op.args);
+                    crumb.put("folder", folder.type);
+                    crumb.put("UIDPLUS", Boolean.toString(((IMAPStore) istore).hasCapability("UIDPLUS")));
+                    Bugsnag.leaveBreadcrumb("operation", BreadcrumbType.STATE, crumb);
+
                     // Fetch most recent copy of message
                     EntityMessage message = null;
                     if (op.message != null)