diff --git a/internal/entity/album_fixtures.go b/internal/entity/album_fixtures.go
index 8a92c5eb4..df0c26985 100644
--- a/internal/entity/album_fixtures.go
+++ b/internal/entity/album_fixtures.go
@@ -245,6 +245,54 @@ var AlbumFixtures = AlbumMap{
 		UpdatedAt:        time.Date(2020, 2, 1, 0, 0, 0, 0, time.UTC),
 		DeletedAt:        nil,
 	},
+	"california-duplicate-1": {
+		ID:               1000009,
+		AlbumUID:         "at1lxuqipotaab12",
+		AlbumSlug:        "california-usa",
+		AlbumPath:        "",
+		AlbumType:        AlbumState,
+		AlbumTitle:       "California / USA",
+		AlbumLocation:    "",
+		AlbumCategory:    "",
+		AlbumCaption:     "",
+		AlbumDescription: "",
+		AlbumNotes:       "",
+		AlbumFilter:      "country:us state:California",
+		AlbumOrder:       "newest",
+		AlbumTemplate:    "",
+		AlbumCountry:     "us",
+		AlbumYear:        0,
+		AlbumMonth:       0,
+		AlbumDay:         0,
+		AlbumFavorite:    false,
+		CreatedAt:        time.Date(2019, 7, 1, 0, 0, 0, 0, time.UTC),
+		UpdatedAt:        time.Date(2020, 2, 1, 0, 0, 0, 0, time.UTC),
+		DeletedAt:        nil,
+	},
+	"california-duplicate-2": {
+		ID:               1000010,
+		AlbumUID:         "at1lxuqipotaab19",
+		AlbumSlug:        "california",
+		AlbumPath:        "",
+		AlbumType:        AlbumState,
+		AlbumTitle:       "California",
+		AlbumLocation:    "",
+		AlbumCategory:    "",
+		AlbumCaption:     "",
+		AlbumDescription: "",
+		AlbumNotes:       "",
+		AlbumFilter:      "public:true country:us state:California",
+		AlbumOrder:       "newest",
+		AlbumTemplate:    "",
+		AlbumCountry:     "us",
+		AlbumYear:        0,
+		AlbumMonth:       0,
+		AlbumDay:         0,
+		AlbumFavorite:    false,
+		CreatedAt:        time.Date(2019, 7, 1, 0, 0, 0, 0, time.UTC),
+		UpdatedAt:        time.Date(2020, 2, 1, 0, 0, 0, 0, time.UTC),
+		DeletedAt:        nil,
+	},
 }
 
 // CreateAlbumFixtures inserts known entities into the database for testing.
diff --git a/internal/photoprism/moments.go b/internal/photoprism/moments.go
index 031b6782f..f3cc302ac 100644
--- a/internal/photoprism/moments.go
+++ b/internal/photoprism/moments.go
@@ -6,6 +6,8 @@ import (
 	"runtime/debug"
 	"strconv"
 
+	"github.com/dustin/go-humanize/english"
+
 	"github.com/photoprism/photoprism/internal/config"
 	"github.com/photoprism/photoprism/internal/entity"
 	"github.com/photoprism/photoprism/internal/form"
@@ -54,6 +56,13 @@ func (w *Moments) Start() (err error) {
 
 	defer mutex.MainWorker.Stop()
 
+	// Remove duplicate moments.
+	if removed, err := query.RemoveDuplicateMoments(); err != nil {
+		log.Warnf("moments: %s (remove duplicates)", err)
+	} else if removed > 0 {
+		log.Infof("moments: removed %s", english.Plural(removed, "duplicate", "duplicates"))
+	}
+
 	counts := query.Counts{}
 	counts.Refresh()
 
diff --git a/internal/query/moments.go b/internal/query/moments.go
index b13c1d868..241fc8be2 100644
--- a/internal/query/moments.go
+++ b/internal/query/moments.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/gosimple/slug"
 
+	"github.com/photoprism/photoprism/internal/entity"
 	"github.com/photoprism/photoprism/internal/maps"
 	"github.com/photoprism/photoprism/pkg/txt"
 )
@@ -262,3 +263,24 @@ func MomentsLabels(threshold int) (results Moments, err error) {
 
 	return results, nil
 }
+
+// RemoveDuplicateMoments deletes generated albums with duplicate slug or filter.
+func RemoveDuplicateMoments() (removed int, err error) {
+	if res := UnscopedDb().Exec(`DELETE FROM links WHERE share_uid 
+		IN (SELECT a.album_uid FROM albums a JOIN albums b ON a.album_type = b.album_type 
+		AND a.album_type <> ? AND a.id > b.id WHERE (a.album_slug = b.album_slug 
+		OR a.album_filter = b.album_filter) GROUP BY a.album_uid)`, entity.AlbumDefault); res.Error != nil {
+		return removed, err
+	}
+
+	if res := UnscopedDb().Exec(`DELETE FROM albums WHERE id 
+		IN (SELECT a.id FROM albums a JOIN albums b ON a.album_type = b.album_type 
+		AND a.album_type <> ? AND a.id > b.id WHERE (a.album_slug = b.album_slug 
+		OR a.album_filter = b.album_filter) GROUP BY a.album_uid)`, entity.AlbumDefault); res.Error != nil {
+		return removed, err
+	} else if res.RowsAffected > 0 {
+		removed = int(res.RowsAffected)
+	}
+
+	return removed, nil
+}
diff --git a/internal/query/moments_test.go b/internal/query/moments_test.go
index f1371a57e..ac00697e7 100644
--- a/internal/query/moments_test.go
+++ b/internal/query/moments_test.go
@@ -3,6 +3,8 @@ package query
 import (
 	"testing"
 
+	"github.com/dustin/go-humanize/english"
+
 	"github.com/stretchr/testify/assert"
 )
 
@@ -205,3 +207,14 @@ func TestMoment_Title(t *testing.T) {
 		assert.Equal(t, "December", moment.Title())
 	})
 }
+
+func TestRemoveDuplicateMoments(t *testing.T) {
+	t.Run("Success", func(t *testing.T) {
+		if removed, err := RemoveDuplicateMoments(); err != nil {
+			t.Fatal(err)
+		} else {
+			t.Logf("moments: removed %s", english.Plural(removed, "duplicate", "duplicates"))
+			assert.Equal(t, 2, removed)
+		}
+	})
+}