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fix issue https://github.com/Z3Prover/z3/issues/4438

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-05-26 10:56:10 -07:00
parent caa384f6c9
commit 52fdb4d291
1 changed files with 1 additions and 1 deletions
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2
src/smt/theory_arith_nl.h
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@ -96,7 +96,7 @@ void theory_arith<Ext>::mark_dependents(theory_var v, svector<theory_var> & vars
// If s is a base variable different from v and it is free, then this row can be ignored.
// It doesn't need to be part of the non linear cluster. For all purposes, this variable
// was eliminated by substitution.
if (is_free(s) && s != v)
if (s != null_theory_var && is_free(s) && s != v)
continue;
typename vector<row_entry>::const_iterator it2 = r.begin_entries();
typename vector<row_entry>::const_iterator end2 = r.end_entries();