diff --git a/libsepol/src/kernel_to_cil.c b/libsepol/src/kernel_to_cil.c
index c16c6fb9..18294a9a 100644
--- a/libsepol/src/kernel_to_cil.c
+++ b/libsepol/src/kernel_to_cil.c
@@ -2397,6 +2397,7 @@ static int write_user_decl_rules_to_cil(FILE *out, struct policydb *pdb)
 	}
 
 	for (i=0; i < pdb->p_users.nprim; i++) {
+		if (!pdb->p_user_val_to_name[i]) continue;
 		rc = strs_add(strs, pdb->p_user_val_to_name[i]);
 		if (rc != 0) {
 			goto exit;
diff --git a/libsepol/src/kernel_to_conf.c b/libsepol/src/kernel_to_conf.c
index 8c923d90..d09f1e90 100644
--- a/libsepol/src/kernel_to_conf.c
+++ b/libsepol/src/kernel_to_conf.c
@@ -2327,6 +2327,7 @@ static int write_user_decl_rules_to_conf(FILE *out, struct policydb *pdb)
 	}
 
 	for (i=0; i < pdb->p_users.nprim; i++) {
+		if (!pdb->p_user_val_to_name[i]) continue;
 		rc = strs_add(strs, pdb->p_user_val_to_name[i]);
 		if (rc != 0) {
 			goto exit;