diff --git a/uppsrc/Sql/SqlVal.cpp b/uppsrc/Sql/SqlVal.cpp
index 433625bc1..98a2e6ea0 100644
--- a/uppsrc/Sql/SqlVal.cpp
+++ b/uppsrc/Sql/SqlVal.cpp
@@ -248,11 +248,15 @@ SqlBool SqlBoolFunc(const char *n, const SqlBool& a, const SqlBool& b, const Sql
 SqlVal Decode(const SqlVal& exp, const SqlSet& variants) {
 	ASSERT(!variants.IsEmpty());
 	Vector<SqlVal> v = variants.Split();
-	ASSERT(v.GetCount() > 2);
+	ASSERT(v.GetCount() > 1);
 	Case cs(exp == v[0], v[1]);
-	for(int i = 2; i + 1 < v.GetCount(); i += 2)
+	int i;
+	for(i = 2; i + 1 < v.GetCount(); i += 2)
 		cs(exp == v[i], v[i + 1]);
-	cs(v.Top());
+	if(i < v.GetCount())
+		cs(v[i]);
+	else
+		cs(Null);
 	return SqlVal(SqlCase(ORACLE, "decode("  + ~exp  + ", " + ~variants + ')')('(' + ~cs + ')'),
 	              SqlS::FN);
 }