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-rw-r--r--src/proof/pdr/pdrIncr.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/proof/pdr/pdrIncr.c b/src/proof/pdr/pdrIncr.c
index c59bfe1c..7bb3319d 100644
--- a/src/proof/pdr/pdrIncr.c
+++ b/src/proof/pdr/pdrIncr.c
@@ -261,6 +261,9 @@ int IPdr_ManRebuildClauses( Pdr_Man_t * p, Vec_Vec_t * vClauses )
int RetValue = -1;
int nCubes = 0;
+ if ( vClauses == NULL )
+ return RetValue;
+
assert( Vec_VecSize(vClauses) >= 2 );
assert( Vec_VecSize(p->vClauses) == 0 );
Vec_VecExpand( p->vClauses, 1 );