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-rw-r--r--src/misc/util/utilTruth.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/misc/util/utilTruth.h b/src/misc/util/utilTruth.h
index c6937b40..0faf8330 100644
--- a/src/misc/util/utilTruth.h
+++ b/src/misc/util/utilTruth.h
@@ -1156,7 +1156,7 @@ static inline int Abc_TtMinBase( word * pTruth, int * pVars, int nVars, int nVar
continue;
if ( k < i )
{
- pVars[k] = pVars[i];
+ if ( pVars ) pVars[k] = pVars[i];
Abc_TtSwapVars( pTruth, nVarsAll, k, i );
}
k++;