Index: pjsip/src/pjsip/sip_transaction.c
===================================================================
--- a/pjsip/src/pjsip/sip_transaction.c	(revision 5510)
+++ b/pjsip/src/pjsip/sip_transaction.c	(working copy)
@@ -1158,20 +1158,20 @@
 	pjsip_event event;
 
 	entry->id = 0;
+	if (tsx->state < PJSIP_TSX_STATE_DESTROYED) {
+	    PJ_LOG(5,(tsx->obj_name, "%s timer event",
+		     (entry==&tsx->retransmit_timer ? "Retransmit":"Timeout")));
+	    pj_log_push_indent();
 
-	PJ_LOG(5,(tsx->obj_name, "%s timer event",
-		 (entry==&tsx->retransmit_timer ? "Retransmit":"Timeout")));
-	pj_log_push_indent();
+	    PJSIP_EVENT_INIT_TIMER(event, entry);
 
+	    /* Dispatch event to transaction. */
+	    pj_grp_lock_acquire(tsx->grp_lock);
+	    (*tsx->state_handler)(tsx, &event);
+	    pj_grp_lock_release(tsx->grp_lock);
 
-	PJSIP_EVENT_INIT_TIMER(event, entry);
-
-	/* Dispatch event to transaction. */
-	pj_grp_lock_acquire(tsx->grp_lock);
-	(*tsx->state_handler)(tsx, &event);
-	pj_grp_lock_release(tsx->grp_lock);
-
-	pj_log_pop_indent();
+	    pj_log_pop_indent();
+	}
     }
 }