diff --git a/backend/app/rest/api/admin.go b/backend/app/rest/api/admin.go
index 39057c1d..cc0e6410 100644
--- a/backend/app/rest/api/admin.go
+++ b/backend/app/rest/api/admin.go
@@ -145,8 +145,8 @@ func (a *admin) setBlockCtrl(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	// delete comments for blocked user.
-	if blockStatus {
+	// delete comments for permanently blocked user.
+	if blockStatus && ttl == time.Duration(0) {
 		if err := a.dataService.DeleteUser(siteID, userID, store.SoftDelete); err != nil {
 			log.Printf("[WARN] can't delete comments for blocked user %s on site %s, %v", userID, siteID, err)
 		}
diff --git a/backend/app/rest/api/admin_test.go b/backend/app/rest/api/admin_test.go
index 9d7ee71c..6398cc24 100644
--- a/backend/app/rest/api/admin_test.go
+++ b/backend/app/rest/api/admin_test.go
@@ -348,8 +348,8 @@ func TestAdmin_Block(t *testing.T) {
 	err = json.Unmarshal([]byte(res), &comments)
 	assert.Nil(t, err)
 	assert.Equal(t, 4, len(comments.Comments), "should have 4 comments")
-	assert.Equal(t, "", comments.Comments[0].Text, "still deleted")
-	assert.True(t, comments.Comments[0].Deleted)
+	assert.Equal(t, "test test #1", comments.Comments[2].Text, "restored")
+	assert.False(t, comments.Comments[2].Deleted)
 
 	assert.False(t, srv.adminRest.dataService.IsBlocked("radio-t", "user1"))
 	assert.False(t, srv.adminRest.dataService.IsBlocked("radio-t", "user2"))