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-rw-r--r--src/select.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/select.c b/src/select.c
index dc388b1f7..397037b17 100644
--- a/src/select.c
+++ b/src/select.c
@@ -3949,6 +3949,7 @@ static int flattenSubquery(
for(pParent=p; pParent; pParent=pParent->pPrior, pSub=pSub->pPrior){
int nSubSrc;
u8 jointype = 0;
+ assert( pSub!=0 );
pSubSrc = pSub->pSrc; /* FROM clause of subquery */
nSubSrc = pSubSrc->nSrc; /* Number of terms in subquery FROM clause */
pSrc = pParent->pSrc; /* FROM clause of the outer query */