diff --git a/src/sat/sat_solver/inc_sat_solver.cpp b/src/sat/sat_solver/inc_sat_solver.cpp
index 4e17ec4d8..003d630d8 100644
--- a/src/sat/sat_solver/inc_sat_solver.cpp
+++ b/src/sat/sat_solver/inc_sat_solver.cpp
@@ -215,9 +215,11 @@ public:
             r = m_solver.check(m_asms.size(), m_asms.c_ptr());
         }
         catch (z3_exception& ex) {
-            IF_VERBOSE(10, verbose_stream() << "exception: " << ex.msg() << "\n";);
-            reason_set = true;
-            set_reason_unknown(std::string("(sat.giveup ") + ex.msg() + ')');
+            IF_VERBOSE(1, verbose_stream() << "exception: " << ex.msg() << "\n";);
+            if (m.inc()) {
+                reason_set = true;
+                set_reason_unknown(std::string("(sat.giveup ") + ex.msg() + ')');
+            }
             r = l_undef;            
         }
         switch (r) {
diff --git a/src/solver/parallel_tactic.cpp b/src/solver/parallel_tactic.cpp
index ef2356678..c8b1c7d3f 100644
--- a/src/solver/parallel_tactic.cpp
+++ b/src/solver/parallel_tactic.cpp
@@ -288,11 +288,15 @@ class parallel_tactic : public tactic {
         }
 
         bool giveup() {
+            if (m_giveup)
+                return m_giveup;
             std::string r = get_solver().reason_unknown(); 
             std::string inc("(incomplete");
             m_giveup |= r.compare(0, inc.size(), inc) == 0;
             inc = "(sat.giveup";
             m_giveup |= r.compare(0, inc.size(), inc) == 0;
+            if (m_giveup)
+                IF_VERBOSE(0, verbose_stream() << r << "\n");
             return m_giveup;
         }