diff --git a/modules/dataquery/php/queries.class.inc b/modules/dataquery/php/queries.class.inc
index 35db18a6674..3277a86359a 100644
--- a/modules/dataquery/php/queries.class.inc
+++ b/modules/dataquery/php/queries.class.inc
@@ -50,6 +50,7 @@ class Queries extends \NDB_Page
                     [
                         'queries' => iterator_to_array(
                             $this->getUserAccessibleQueries($user),
+                            false, // do not preserve keys, stay an array
                         ),
                     ]
                 );
diff --git a/modules/dataquery/php/query.class.inc b/modules/dataquery/php/query.class.inc
index 1870b1e9c34..348d14de4ad 100644
--- a/modules/dataquery/php/query.class.inc
+++ b/modules/dataquery/php/query.class.inc
@@ -102,20 +102,27 @@ class Query implements \LORIS\StudyEntities\AccessibleResource,
         }
 
         // Check accessibility for fields
-        $fields = $this->getFields();
-        foreach ($fields as $field) {
-            if ($field->isAccessibleBy($user) === false) {
-                return false;
+        try {
+            $fields = $this->getFields();
+            foreach ($fields as $field) {
+                if ($field->isAccessibleBy($user) === false) {
+                    return false;
+                }
             }
-        }
 
-        // Check accessibility for dictionary items in the criteria
-        $critfields = $this->_getAllCriteriaDictionaries($criteria);
-        foreach ($critfields as $field) {
-            if ($field->isAccessibleBy($user) === false) {
-                return false;
-            }
+            // Check accessibility for dictionary items in the criteria
+            $critfields = $this->_getAllCriteriaDictionaries($criteria);
+            foreach ($critfields as $field) {
+                if ($field->isAccessibleBy($user) === false) {
+                    return false;
+                }
 
+            }
+        } catch (\OutOfBoundsException $e) {
+            // The query references a field that no longer exists.
+            // The module can not provide the data, so the query is
+            // not accessible by anyone.
+            return false;
         }
         return true;
     }
@@ -175,7 +182,10 @@ class Query implements \LORIS\StudyEntities\AccessibleResource,
                 $cname = $item['category'];
                 $fname = $item['fieldname'];
                 $this->_populateModuleDictCache($mname);
-                assert(isset($this->moduleDictCache[$mname][$cname][$fname]));
+                if (!isset($this->moduleDictCache[$mname][$cname][$fname])) {
+                    // This query references a field that no longer exist.
+                    throw new \OutOfBoundsException();
+                }
                 $usedDicts[] = $this->moduleDictCache[$mname][$cname][$fname];
             }
         }
@@ -373,7 +383,10 @@ class Query implements \LORIS\StudyEntities\AccessibleResource,
             $fname = $field['field'];
 
             $this->_populateModuleDictCache($mname);
-
+            if (!isset($this->moduleDictCache[$mname][$cname][$fname])) {
+                // This query references a field that no longer exist.
+                throw new \OutOfBoundsException();
+            }
             assert(isset($this->moduleDictCache[$mname][$cname][$fname]));
             $fields[] = $this->moduleDictCache[$mname][$cname][$fname];
         }