diff --git a/mclog2psql/main.py b/mclog2psql/main.py
index 04df920..e17f43d 100644
--- a/mclog2psql/main.py
+++ b/mclog2psql/main.py
@@ -95,7 +95,11 @@ def insert_sessions_into_db(
 
                 execute_values(
                     cur,
-                    "INSERT INTO minecraft_login_sessions(username, start, duration) VALUES %s",
+                    """
+                        INSERT INTO minecraft_login_sessions(username, start, duration)
+                        VALUES %s
+                        ON CONFLICT DO NOTHING
+                    """,
                     [(e.username, e.start_time, e.duration) for e in session_log],
                     template=None,
                     page_size=1000,