diff --git a/robot/resources/lib/python/json_transformers.py b/robot/resources/lib/python/json_transformers.py
index b3895537..6bfa0793 100644
--- a/robot/resources/lib/python/json_transformers.py
+++ b/robot/resources/lib/python/json_transformers.py
@@ -42,8 +42,14 @@ def decode_split_header(data: dict):
     '''
     try:
         data["splitId"] = json_reencode(data["splitId"])
-        data["lastPart"] = json_reencode(data["lastPart"]["value"])
-        data["link"] = json_reencode(data["link"]["value"])
+        data["lastPart"] = (
+                    json_reencode(data["lastPart"]["value"])
+                    if data["lastPart"] else None
+                )
+        data["link"] = (
+                    json_reencode(data["link"]["value"])
+                    if data["link"] else None
+                )
     except Exception as exc:
         raise ValueError(f"failed to decode JSON output: {exc}") from exc
 
diff --git a/robot/resources/lib/robot/complex_object_operations.robot b/robot/resources/lib/robot/complex_object_operations.robot
index 51bd7539..2ee4a765 100644
--- a/robot/resources/lib/robot/complex_object_operations.robot
+++ b/robot/resources/lib/robot/complex_object_operations.robot
@@ -2,7 +2,7 @@
 Variables   common.py
 
 Library     neofs_verbs.py
-Library     complex_object_operations.py
+Library     complex_object_actions.py
 
 
 *** Keywords ***
@@ -14,7 +14,7 @@ Get Object Parts By Link Object
     [Arguments]         ${WIF}  ${CID}  ${LARGE_OID}
 
 
-    &{RESPONSE} =       Get Link Object     ${WIF}  ${CID}  ${LARGE_OID}
-    &{LINK_HEADER} =    Head Object         ${WIF}  ${CID}  ${RESPONSE.link}    is_raw=True
+    ${LINK_OID} =       Get Link Object     ${WIF}  ${CID}  ${LARGE_OID}
+    &{LINK_HEADER} =    Head Object         ${WIF}  ${CID}  ${LINK_OID}    is_raw=True
 
     [Return]    ${LINK_HEADER.header.split.children}