diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index 444274270..1890acaae 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -1800,7 +1800,7 @@ static void track_id(ast* n, unsigned id) {
     if (n->get_id() != id) return;
     ++s_count;
     std::cout << s_count << "\n";
-    SASSERT(s_count != 1);
+    //SASSERT(s_count != 1);
 }
 #endif
 
@@ -1834,7 +1834,7 @@ ast * ast_manager::register_node_core(ast * n) {
 
     n->m_id = is_decl(n) ? m_decl_id_gen.mk() : m_expr_id_gen.mk();
 
-    // track_id(n, 2147483792);
+    // track_id(n, 70);
 
     TRACE("ast", tout << "Object " << n->m_id << " was created.\n";);
     TRACE("mk_var_bug", tout << "mk_ast: " << n->m_id << "\n";);
diff --git a/src/smt/asserted_formulas.cpp b/src/smt/asserted_formulas.cpp
index e535633cd..c76c61ed9 100644
--- a/src/smt/asserted_formulas.cpp
+++ b/src/smt/asserted_formulas.cpp
@@ -421,7 +421,7 @@ void asserted_formulas::nnf_cnf() {
     for (; i < sz; i++) {
         expr * n    = m_formulas[i].get_fml();
         TRACE("nnf_bug", tout << "processing:\n" << mk_pp(n, m) << "\n";);
-        proof * pr  = m_formulas[i].get_proof();
+        proof_ref pr(m_formulas[i].get_proof(), m);
         expr_ref   r1(m);
         proof_ref  pr1(m);
         push_todo.reset();