--- a/src/backend/executor/execExprInterp.c
+++ b/src/backend/executor/execExprInterp.c
@@ -3829,6 +3829,7 @@ ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op)
         {
                 Datum      *argvalue = op->d.xmlexpr.argvalue;
                 bool       *argnull = op->d.xmlexpr.argnull;
+                               text       *result;

                 /* argument type is known to be xml */
                 Assert(list_length(xexpr->args) == 1);
@@ -3837,8 +3838,14 @@ ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op)
                         return;
                 value = argvalue[0];

-                               *op->resvalue =