diff --git a/scst/src/scst_lib.c b/scst/src/scst_lib.c
index b20303b6b..a8f3efdde 100644
--- a/scst/src/scst_lib.c
+++ b/scst/src/scst_lib.c
@@ -3548,7 +3548,7 @@ int scst_acg_add_lun(struct scst_acg *acg, struct kobject *parent,
 
 	PRINT_INFO("Added device %s to group %s (LUN %lld, "
 		"rd_only %d) to target %s", dev->virt_name, acg->acg_name,
-		(long long unsigned int)lun, read_only, acg->tgt->tgt_name);
+		lun, read_only, acg->tgt ? acg->tgt->tgt_name : "?");
 
 	if (out_acg_dev != NULL)
 		*out_acg_dev = acg_dev;
@@ -3600,7 +3600,7 @@ int scst_acg_del_lun(struct scst_acg *acg, uint64_t lun,
 		scst_report_luns_changed(acg);
 
 	PRINT_INFO("Removed LUN %lld from group %s (target %s)",
-		(unsigned long long)lun, acg->acg_name, acg->tgt->tgt_name);
+		lun, acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?");
 
 out:
 	TRACE_EXIT_RES(res);
@@ -4390,7 +4390,7 @@ int scst_acg_add_acn(struct scst_acg *acg, const char *name)
 out:
 	if (res == 0) {
 		PRINT_INFO("Added name %s to group %s (target %s)", name,
-			acg->acg_name, acg->tgt->tgt_name);
+			acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?");
 		scst_check_reassign_sessions();
 	}
 
@@ -4464,7 +4464,7 @@ int scst_acg_remove_name(struct scst_acg *acg, const char *name, bool reassign)
 
 	if (res == 0) {
 		PRINT_INFO("Removed name %s from group %s (target %s)", name,
-			acg->acg_name, acg->tgt->tgt_name);
+			acg->acg_name, acg->tgt ? acg->tgt->tgt_name : "?");
 		if (reassign)
 			scst_check_reassign_sessions();
 	} else