diff --git a/src/sat/sat_solver.cpp b/src/sat/sat_solver.cpp
index d917d1ae6..b933b6ddb 100644
--- a/src/sat/sat_solver.cpp
+++ b/src/sat/sat_solver.cpp
@@ -1656,6 +1656,7 @@ namespace sat {
         m_min_core.reset();
         m_simplifier.init_search();
         TRACE("sat", display(tout););
+
     }
 
     /**
diff --git a/src/sat/sat_solver/inc_sat_solver.cpp b/src/sat/sat_solver/inc_sat_solver.cpp
index 8a0747d15..9ca1150a9 100644
--- a/src/sat/sat_solver/inc_sat_solver.cpp
+++ b/src/sat/sat_solver/inc_sat_solver.cpp
@@ -345,9 +345,10 @@ public:
         m.is_not(var, var);
         sat::bool_var v = m_map.to_bool_var(var);
         if (v == sat::null_bool_var) {
-            throw default_exception("literal does not correspond to a Boolean variable");
+            v = m_solver.add_var(true);
+            m_map.insert(var, v);
         }
-        m_solver.set_activity(v, activity);
+        m_solver.set_activity(v, static_cast<unsigned>(activity));
     }
 
     proof * get_proof() override {