diff --git a/workbench b/workbench
index 06f572e5..e7cbdf13 100755
--- a/workbench
+++ b/workbench
@@ -115,16 +115,18 @@ def create():
         # Therefore, only tasks whose names are registered there should populate
         # their objects' 'field_member_of'.
         secondary_task_data = read_node_ids_tsv(config)
-        if os.path.abspath(args.config) in json.loads(os.environ["ISLANDORA_WORKBENCH_SECONDARY_TASKS"]):
-            if len(secondary_task_data) > 0:
-                if 'field_member_of' in row and 'parent_id' in row and row['parent_id'] in secondary_task_data.keys():
-                    row['field_member_of'] = secondary_task_data[row['parent_id']]
-                else:
-                    # If there is no parent ID/nid pair in the secondary_task_data mapping,
-                    # either because it wasn't in the primary CSV or it failed to be created
-                    # in the primary task, skip creating the current secondary node and move on.
-                    logging.warning('Node for row with ID %s in secondary task CSV not created because its parent was not present or not created in the primary task.', id_field)
-                    continue
+
+        if os.environ.get('ISLANDORA_WORKBENCH_SECONDARY_TASKS') is not None:
+            if os.path.abspath(args.config) in json.loads(os.environ["ISLANDORA_WORKBENCH_SECONDARY_TASKS"]):
+                if len(secondary_task_data) > 0:
+                    if 'field_member_of' in row and 'parent_id' in row and row['parent_id'] in secondary_task_data.keys():
+                        row['field_member_of'] = secondary_task_data[row['parent_id']]
+                    else:
+                        # If there is no parent ID/nid pair in the secondary_task_data mapping,
+                        # either because it wasn't in the primary CSV or it failed to be created
+                        # in the primary task, skip creating the current secondary node and move on.
+                        logging.warning('Node for row with ID %s in secondary task CSV not created because its parent was not present or not created in the primary task.', id_field)
+                        continue
 
         # Add custom (non-required) CSV fields.
         entity_fields = get_entity_fields(config, 'node', config['content_type'])
diff --git a/workbench_utils.py b/workbench_utils.py
index 2f1d039f..16ba157a 100644
--- a/workbench_utils.py
+++ b/workbench_utils.py
@@ -6096,7 +6096,10 @@ def prep_node_ids_tsv(config):
        populate their objects' 'field_member_of'. We write the parent ID->nid map to this file
        as well, in write_to_node_ids_tsv().
     """
-    path_to_tsv_file = os.path.join(os.environ["ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR"], config['secondary_tasks_data_file'])
+    if os.environ.get('ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR') is not None:
+        path_to_tsv_file = os.path.join(os.environ["ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR"], config['secondary_tasks_data_file'])
+    else:
+        path_to_tsv_file = os.path.join(config['temp_dir'], config['secondary_tasks_data_file'])
     if os.path.exists(path_to_tsv_file):
         os.remove(path_to_tsv_file)
     if len(config['secondary_tasks']) > 0:
@@ -6110,7 +6113,10 @@ def prep_node_ids_tsv(config):
 
 
 def write_to_node_ids_tsv(config, row_id, node_id):
-    path_to_tsv_file = os.path.join(os.environ["ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR"], config['secondary_tasks_data_file'])
+    if os.environ.get('ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR') is not None:
+        path_to_tsv_file = os.path.join(os.environ["ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR"], config['secondary_tasks_data_file'])
+    else:
+        path_to_tsv_file = os.path.join(config['temp_dir'], config['secondary_tasks_data_file'])
     tsv_file = open(path_to_tsv_file, "a+", encoding='utf-8')
     tsv_file.write(str(row_id) + "\t" + str(node_id) + "\n")
     tsv_file.close()
@@ -6118,7 +6124,10 @@ def write_to_node_ids_tsv(config, row_id, node_id):
 
 def read_node_ids_tsv(config):
     map = dict()
-    path_to_tsv_file = os.path.join(os.environ["ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR"], config['secondary_tasks_data_file'])
+    if os.environ.get('ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR') is not None:
+        path_to_tsv_file = os.path.join(os.environ["ISLANDORA_WORKBENCH_PRIMARY_TASK_TEMP_DIR"], config['secondary_tasks_data_file'])
+    else:
+        path_to_tsv_file = os.path.join(config['temp_dir'], config['secondary_tasks_data_file'])
     if config['secondary_tasks'] is not None:
         if not os.path.exists(path_to_tsv_file):
             message = 'Secondary task data file ' + path_to_tsv_file + ' not found.'