diff --git a/common/src/main/java/net/william278/huskclaims/user/Preferences.java b/common/src/main/java/net/william278/huskclaims/user/Preferences.java
index 8fafbffb..20cfc23d 100644
--- a/common/src/main/java/net/william278/huskclaims/user/Preferences.java
+++ b/common/src/main/java/net/william278/huskclaims/user/Preferences.java
@@ -57,7 +57,7 @@ public class Preferences implements AuditLogger {
 
     @Expose
     @SerializedName("audit_log")
-    private Map<String, Entry> logEntries = Maps.newHashMap();
+    private Map<String, Entry> logEntries = Maps.newConcurrentMap();
 
     @Expose
     @SerializedName("claiming_mode")
diff --git a/common/src/main/java/net/william278/huskclaims/user/PreferencesSerializer.java b/common/src/main/java/net/william278/huskclaims/user/PreferencesSerializer.java
index a6db6281..e2f19043 100644
--- a/common/src/main/java/net/william278/huskclaims/user/PreferencesSerializer.java
+++ b/common/src/main/java/net/william278/huskclaims/user/PreferencesSerializer.java
@@ -51,7 +51,7 @@ public void write(@NotNull JsonWriter out, @NotNull Preferences prefs) throws IO
     private void writeAuditLog(@NotNull JsonWriter out, @NotNull Map<String, AuditLogger.Entry> auditLog) throws IOException {
         out.beginObject();
         int i = 0;
-        for (Map.Entry<String, AuditLogger.Entry> entry : auditLog.entrySet()) {
+        for (Map.Entry<String, AuditLogger.Entry> entry : Map.copyOf(auditLog).entrySet()) {
             if (i >= maxPersistedLogEntries) {
                 break;
             }
@@ -102,7 +102,7 @@ public Preferences read(@NotNull JsonReader in) throws IOException {
 
     @NotNull
     private Map<String, AuditLogger.Entry> readAuditLog(@NotNull JsonReader in) throws IOException {
-        final Map<String, AuditLogger.Entry> auditLog = Maps.newHashMap();
+        final Map<String, AuditLogger.Entry> auditLog = Maps.newConcurrentMap();
         in.beginObject();
         while (in.hasNext()) {
             auditLog.put(in.nextName(), readAuditLogEntry(in));