Fixed issue with aggregation field.

CHANGELOG.md

+# Version 1.11.1
+
+* Fixed issue with aggregation field.
+
 # Version 1.11.0
 
 * Added Field Output Handler for outputting a text when a contact has a certain relationship.

Civi/DataProcessor/FieldOutputHandler/AggregateFunctionFieldOutputHandler.php

@@ -109,6 +109,41 @@ class AggregateFunctionFieldOutputHandler extends AbstractSimpleFieldOutputHandl
     }
   }
 
+  /**
+   * Initialize a field.
+   * Returns the datasource and the field specification
+   * The new alias is set as alias in the field.
+   *
+   * @param $fieldAlias
+   * @param $datasourceName
+   * @param $newAlias
+   *
+   * @return array
+   * @throws \Civi\DataProcessor\Exception\DataSourceNotFoundException
+   * @throws \Civi\DataProcessor\Exception\FieldNotFoundException
+   */
+  protected function initializeField($fieldAlias, $datasourceName, $newAlias) {
+    $dataSource = $this->dataProcessor->getDataSourceByName($datasourceName);
+    if (!$dataSource) {
+      throw new DataSourceNotFoundException(E::ts("Field %1 requires data source '%2' which could not be found. Did you rename or deleted the data source?", array(1=>$newAlias, 2=>$datasourceName)));
+    }
+    $inputFieldSpec = $dataSource->getAvailableFields()->getFieldSpecificationByAlias($fieldAlias);
+    if (!$inputFieldSpec) {
+      $inputFieldSpec = $dataSource->getAvailableFields()->getFieldSpecificationByName($fieldAlias);
+    }
+    if (!$inputFieldSpec) {
+      throw new FieldNotFoundException(E::ts("Field %1 requires a field with the name '%2' in the data source '%3'. Did you change the data source type?", array(
+        1 => $newAlias,
+        2 => $fieldAlias,
+        3 => $datasourceName
+      )));
+    }
+
+    $inputFieldSpec = clone $inputFieldSpec;
+    $inputFieldSpec->alias = $newAlias;
+    return [$dataSource, $inputFieldSpec];
+  }
+
   /**
    * When this handler has additional configuration you can add
    * the fields on the form with this function.

info.xml

@@ -14,8 +14,8 @@
     <url desc="Documentation">https://lab.civicrm.org/extensions/dataprocessor/blob/master/README.md</url>
     <url desc="Licensing">http://www.gnu.org/licenses/agpl-3.0.html</url>
   </urls>
-  <releaseDate>2020-07-28</releaseDate>
-  <version>1.11.0</version>
+  <releaseDate>2020-12-10</releaseDate>
+  <version>1.11.1</version>
   <develStage>stable</develStage>
   <compatibility>
     <ver>4.7</ver>