diff --git a/channels/chan_pjsip.c b/channels/chan_pjsip.c
index 22f834d376..5ad1174047 100644
--- a/channels/chan_pjsip.c
+++ b/channels/chan_pjsip.c
@@ -1466,7 +1466,8 @@ static void transfer_redirect(struct ast_sip_session *session, const char *targe
 	pjsip_contact_hdr *contact;
 	pj_str_t tmp;
 
-	if (pjsip_inv_end_session(session->inv_session, 302, NULL, &packet) != PJ_SUCCESS) {
+	if (pjsip_inv_end_session(session->inv_session, 302, NULL, &packet) != PJ_SUCCESS
+		|| !packet) {
 		ast_log(LOG_WARNING, "Failed to redirect PJSIP session for channel %s\n",
 			ast_channel_name(session->channel));
 		message = AST_TRANSFER_FAILED;
@@ -2231,7 +2232,8 @@ static int chan_pjsip_incoming_request(struct ast_sip_session *session, struct p
 	ast_sip_session_add_datastore(session, datastore);
 
 	if (!(session->channel = chan_pjsip_new(session, AST_STATE_RING, session->exten, NULL, NULL, NULL, NULL))) {
-		if (pjsip_inv_end_session(session->inv_session, 503, NULL, &packet) == PJ_SUCCESS) {
+		if (pjsip_inv_end_session(session->inv_session, 503, NULL, &packet) == PJ_SUCCESS
+			&& packet) {
 			ast_sip_session_send_response(session, packet);
 		}
 
diff --git a/res/res_pjsip_refer.c b/res/res_pjsip_refer.c
index df54251798..1043a1e24d 100644
--- a/res/res_pjsip_refer.c
+++ b/res/res_pjsip_refer.c
@@ -969,7 +969,8 @@ inv_replace_failed:
 		session->defer_terminate = 1;
 		ast_hangup(session->channel);
 
-		if (pjsip_inv_end_session(session->inv_session, response, NULL, &packet) == PJ_SUCCESS) {
+		if (pjsip_inv_end_session(session->inv_session, response, NULL, &packet) == PJ_SUCCESS
+			&& packet) {
 			ast_sip_session_send_response(session, packet);
 		}
 	} else {
diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c
index eb9551097a..6287c17ec0 100644
--- a/res/res_pjsip_session.c
+++ b/res/res_pjsip_session.c
@@ -2651,7 +2651,8 @@ static void session_inv_on_tsx_state_changed(pjsip_inv_session *inv, pjsip_trans
 						}
 						if (tsx->status_code != 488) {
 							/* Other reinvite failures (except 488) result in destroying the session. */
-							if (pjsip_inv_end_session(inv, 500, NULL, &tdata) == PJ_SUCCESS) {
+							if (pjsip_inv_end_session(inv, 500, NULL, &tdata) == PJ_SUCCESS
+								&& tdata) {
 								ast_sip_session_send_request(session, tdata);
 							}
 						}
@@ -2664,7 +2665,8 @@ static void session_inv_on_tsx_state_changed(pjsip_inv_session *inv, pjsip_trans
 						 * a cancelled call. Our role is to immediately send a BYE to end the
 						 * dialog.
 						 */
-						if (pjsip_inv_end_session(inv, 500, NULL, &tdata) == PJ_SUCCESS) {
+						if (pjsip_inv_end_session(inv, 500, NULL, &tdata) == PJ_SUCCESS
+							&& tdata) {
 							ast_sip_session_send_request(session, tdata);
 						}
 					}