diff --git a/src/plugins/replication/replication-plugin.c b/src/plugins/replication/replication-plugin.c
index 93cffca612..d6f059c15f 100644
--- a/src/plugins/replication/replication-plugin.c
+++ b/src/plugins/replication/replication-plugin.c
@@ -106,6 +106,7 @@ static void replication_notify_now(struct mail_user *user)
 	struct replication_user *ruser = REPLICATION_USER_CONTEXT(user);
 	int ret;
 
+	i_assert(ruser != NULL);
 	i_assert(ruser->priority != REPLICATION_PRIORITY_NONE);
 	i_assert(ruser->priority != REPLICATION_PRIORITY_SYNC);
 
@@ -129,6 +130,8 @@ static int replication_notify_sync(struct mail_user *user)
 	ssize_t ret;
 	bool success = FALSE;
 
+	i_assert(ruser != NULL);
+
 	fd = net_connect_unix(ruser->socket_path);
 	if (fd == -1) {
 		i_error("net_connect_unix(%s) failed: %m", ruser->socket_path);
@@ -302,6 +305,8 @@ static void replication_user_deinit(struct mail_user *user)
 {
 	struct replication_user *ruser = REPLICATION_USER_CONTEXT(user);
 
+	i_assert(ruser != NULL);
+
 	if (ruser->to != NULL) {
 		replication_notify_now(user);
 		if (ruser->to != NULL) {