1 files changed, 3 insertions, 0 deletions
diff --git a/src/expr.c b/src/expr.c
index f40f16061..c869d762f 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -1324,6 +1324,7 @@ static Expr *exprDup(sqlite3 *db, Expr *p, int dupFlags, u8 **pzBuffer){
   if( pzBuffer ){
     zAlloc = *pzBuffer;
     staticFlag = EP_Static;
+    assert( zAlloc!=0 );
   }else{
     zAlloc = sqlite3DbMallocRawNN(db, dupedExprSize(p, dupFlags));
     staticFlag = 0;
@@ -2356,8 +2357,10 @@ int sqlite3ExprIsInteger(Expr *p, int *pValue){
 */
 int sqlite3ExprCanBeNull(const Expr *p){
   u8 op;
+  assert( p!=0 );
   while( p->op==TK_UPLUS || p->op==TK_UMINUS ){
     p = p->pLeft;
+    assert( p!=0 );
   }
   op = p->op;
   if( op==TK_REGISTER ) op = p->op2;