[Core] Fix crash while writing text_frame in conference

diff --git a/src/switch_core_media.c b/src/switch_core_media.c
index 810306a91dbd339685dc10801fcd3dccd4cbfc9b..674c5b92f989a10c10f6f0936065fed91f8b9703 100644 (file)
--- a/src/switch_core_media.c
+++ b/src/switch_core_media.c
@@ -15502,6 +15502,11 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_text_frame(switch_core
 
        t_engine = &smh->engines[SWITCH_MEDIA_TYPE_TEXT];
 
+       if (!t_engine || !t_engine->tf) {
+               switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "text engine not available for processing\n");
+               switch_goto_status(SWITCH_STATUS_BREAK, done);
+       }
+
        if (!is_msrp && switch_channel_test_cap(session->channel, CC_RTP_RTT)) {
 
                if (frame) {