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-rw-r--r--src/sat/bsat/satSolver2.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/sat/bsat/satSolver2.c b/src/sat/bsat/satSolver2.c
index 2b65170a..180659a4 100644
--- a/src/sat/bsat/satSolver2.c
+++ b/src/sat/bsat/satSolver2.c
@@ -1276,6 +1276,7 @@ int sat_solver2_addclause(sat_solver2* s, lit* begin, lit* end, int Id)
int maxvar, count, temp;
assert( solver2_dlevel(s) == 0 );
assert( begin < end );
+ assert( Id != 0 );
// copy clause into storage
veci_resize( &s->temp_clause, 0 );