diff --git a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java
index eee53e2..19cc680 100644
--- a/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java
+++ b/asterixdb/asterix-algebra/src/main/java/org/apache/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java
@@ -458,7 +458,8 @@
         for (int i = openFields.nextSetBit(0); i >= 0; i = openFields.nextSetBit(i + 1)) {
             newArguments.add(arguments.get(i * 2));
             Mutable<ILogicalExpression> expRef = arguments.get(i * 2 + 1);
-            injectCastToRelaxType(expRef, inputFieldTypes[i], env);
+            IAType expType = (IAType) env.getType(expRef.getValue());
+            injectCastToRelaxType(expRef, expType, env);
             newArguments.add(expRef);
         }
 
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/query-ASTERIXDB-2529/query-ASTERIXDB-2529.2.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/query-ASTERIXDB-2529/query-ASTERIXDB-2529.2.query.sqlpp
new file mode 100644
index 0000000..9aecebe
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/query-ASTERIXDB-2529/query-ASTERIXDB-2529.2.query.sqlpp
@@ -0,0 +1,23 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+FROM [
+  {"id": 1, "t1": (array_append(missing, 3, 9))}            // missing
+] AS d
+SELECT VALUE d
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/query-ASTERIXDB-2529/query-ASTERIXDB-2529.2.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/query-ASTERIXDB-2529/query-ASTERIXDB-2529.2.adm
new file mode 100644
index 0000000..5c0326b
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/query-ASTERIXDB-2529/query-ASTERIXDB-2529.2.adm
@@ -0,0 +1 @@
+{ "id": 1 }
\ No newline at end of file