Index: head/mail/dovecot/files/patch-src_lib-master_master-service.c
===================================================================
--- head/mail/dovecot/files/patch-src_lib-master_master-service.c	(revision 489515)
+++ head/mail/dovecot/files/patch-src_lib-master_master-service.c	(revision 489516)
@@ -1,11 +1,11 @@
 --- src/lib-master/master-service.c.orig	2019-01-06 17:42:52 UTC
 +++ src/lib-master/master-service.c
 @@ -341,7 +341,7 @@ master_service_init(const char *name, enum master_serv
  	if ((flags & MASTER_SERVICE_FLAG_DONT_SEND_STATS) == 0) {
  		/* Initialize stats-client early so it can see all events. */
  		value = getenv(DOVECOT_STATS_WRITER_SOCKET_PATH);
 -		if (value != NULL)
-+		if (value != NULL && *value = '\0')
++		if (value != NULL && *value != '\0')
  			service->stats_client = stats_client_init(value, FALSE);
  	}