diff --git a/core/libs/prx/libSceSaveDataDialog.native/Export.cpp b/core/libs/prx/libSceSaveDataDialog.native/Export.cpp
index 3c834f7d9c..d042e8c8e7 100644
--- a/core/libs/prx/libSceSaveDataDialog.native/Export.cpp
+++ b/core/libs/prx/libSceSaveDataDialog.native/Export.cpp
@@ -33,6 +33,9 @@ int APS5_VABI sceSaveDataDialogUpdateStatus(void) {
 }
 
 int APS5_VABI sceSaveDataDialogGetResult(void* result) {
+ if (g_status != SAVE_DATA_DIALOG_STATUS_FINISHED) {
+  return SAVE_DATA_DIALOG_ERROR_NOT_FINISHED;
+ }
  if (result == nullptr) {
   return SAVE_DATA_DIALOG_ERROR_ARG_NULL;
  }
@@ -76,6 +79,9 @@ int APS5_VABI sceSaveDataDialogOpen(const void* param) {
 
 int APS5_VABI sceSaveDataDialogClose(const void* closeParam) {
  (void)closeParam;
+ if (g_status != SAVE_DATA_DIALOG_STATUS_RUNNING) {
+  return SAVE_DATA_DIALOG_ERROR_NOT_RUNNING;
+ }
  g_status = SAVE_DATA_DIALOG_STATUS_FINISHED;
  return SAVE_DATA_DIALOG_OK;
 }
@@ -85,6 +91,9 @@ int APS5_VABI sceSaveDataDialogIsReadyToDisplay(void) {
 }
 
 int APS5_VABI sceSaveDataDialogTerminate(void) {
+ if (g_status == SAVE_DATA_DIALOG_STATUS_NONE) {
+  return SAVE_DATA_DIALOG_ERROR_NOT_INITIALIZED;
+ }
  g_status = SAVE_DATA_DIALOG_STATUS_NONE;
  g_mode = 0;
  g_user_data = nullptr;
diff --git a/core/libs/prx/libSceSaveDataDialog.native/SaveDataDialog.hpp b/core/libs/prx/libSceSaveDataDialog.native/SaveDataDialog.hpp
index 3259b8d482..7a8eda2bd0 100644
--- a/core/libs/prx/libSceSaveDataDialog.native/SaveDataDialog.hpp
+++ b/core/libs/prx/libSceSaveDataDialog.native/SaveDataDialog.hpp
@@ -7,7 +7,9 @@
 constexpr int SAVE_DATA_DIALOG_OK = 0;
 constexpr int SAVE_DATA_DIALOG_ERROR_NOT_INITIALIZED = static_cast<int>(0x80B80003);
 constexpr int SAVE_DATA_DIALOG_ERROR_ALREADY_INITIALIZED = static_cast<int>(0x80B80004);
+constexpr int SAVE_DATA_DIALOG_ERROR_NOT_FINISHED = static_cast<int>(0x80B80005);
 constexpr int SAVE_DATA_DIALOG_ERROR_INVALID_STATE = static_cast<int>(0x80B80006);
+constexpr int SAVE_DATA_DIALOG_ERROR_NOT_RUNNING = static_cast<int>(0x80B8000B);
 constexpr int SAVE_DATA_DIALOG_ERROR_ARG_NULL = static_cast<int>(0x80B8000D);
 
 constexpr int SAVE_DATA_DIALOG_STATUS_NONE = 0;
diff --git a/core/libs/tests/GuestSaveDataDialog.cpp b/core/libs/tests/GuestSaveDataDialog.cpp
index 5d8e063710..2a44ff62d5 100644
--- a/core/libs/tests/GuestSaveDataDialog.cpp
+++ b/core/libs/tests/GuestSaveDataDialog.cpp
@@ -34,7 +34,16 @@ static void RequireRunning() {
 }
 
 int main() {
+    Require(sceSaveDataDialogGetStatus() == SAVE_DATA_DIALOG_STATUS_NONE, "initial status");
+    Require(sceSaveDataDialogTerminate() == SAVE_DATA_DIALOG_ERROR_NOT_INITIALIZED, "terminate before init");
+    Require(sceSaveDataDialogClose(nullptr) == SAVE_DATA_DIALOG_ERROR_NOT_RUNNING, "close before init");
+    SaveDataDialogResult uninitResult{};
+    Require(sceSaveDataDialogGetResult(&uninitResult) == SAVE_DATA_DIALOG_ERROR_NOT_FINISHED, "get result before init");
+
     Require(sceSaveDataDialogInitialize() == 0, "initialize");
+    Require(sceSaveDataDialogInitialize() == SAVE_DATA_DIALOG_ERROR_ALREADY_INITIALIZED, "double init");
+    Require(sceSaveDataDialogClose(nullptr) == SAVE_DATA_DIALOG_ERROR_NOT_RUNNING, "close while initialized not running");
+    Require(sceSaveDataDialogGetResult(&uninitResult) == SAVE_DATA_DIALOG_ERROR_NOT_FINISHED, "get result before open");
 
     SaveDataDirName names[2]{{}, {"SDU1"}};
     SaveDataDialogItems items{};
@@ -57,6 +66,8 @@ int main() {
         RequireRunning();
         Require(sceSaveDataDialogProgressBarSetValue(0, 100) == 0, "complete progress");
         RequireRunning();
+        Require(sceSaveDataDialogGetResult(&uninitResult) == SAVE_DATA_DIALOG_ERROR_NOT_FINISHED,
+                "get result while running");
         Require(sceSaveDataDialogClose(nullptr) == 0, "close save progress");
         Require(sceSaveDataDialogUpdateStatus() == SAVE_DATA_DIALOG_STATUS_FINISHED,
                 "closing save progress must finish it");
@@ -69,10 +80,18 @@ int main() {
                 "save result must preserve its mode, directory and caller context");
     }
 
+    Require(sceSaveDataDialogOpen(&param) == 0, "open save progress for terminate test");
+    RequireRunning();
+    Require(sceSaveDataDialogTerminate() == 0, "terminate while running");
+    Require(sceSaveDataDialogGetStatus() == SAVE_DATA_DIALOG_STATUS_NONE, "terminated state");
+    Require(sceSaveDataDialogTerminate() == SAVE_DATA_DIALOG_ERROR_NOT_INITIALIZED, "terminate after terminate");
+
+    Require(sceSaveDataDialogInitialize() == 0, "re-initialize");
     param.mode = 1;
     Require(sceSaveDataDialogOpen(&param) == 0, "open selection dialog");
     Require(sceSaveDataDialogUpdateStatus() == SAVE_DATA_DIALOG_STATUS_FINISHED,
             "selection dialog must retain the existing automatic response");
     Require(sceSaveDataDialogTerminate() == 0, "terminate");
+    Require(sceSaveDataDialogTerminate() == SAVE_DATA_DIALOG_ERROR_NOT_INITIALIZED, "terminate when already terminated");
     Require(sceSaveDataDialogGetStatus() == SAVE_DATA_DIALOG_STATUS_NONE, "terminated state");
 }
diff --git a/docs/dev/debt/libSceSaveDataDialog.native.md b/docs/dev/debt/libSceSaveDataDialog.native.md
index a06b238913..ee6bb8dc2d 100644
--- a/docs/dev/debt/libSceSaveDataDialog.native.md
+++ b/docs/dev/debt/libSceSaveDataDialog.native.md
@@ -2,4 +2,4 @@
 
 ### Silent stubs
 
-- [libSceSaveDataDialog.native](../../../core/libs/prx/libSceSaveDataDialog.native/Export.cpp) shows no UI and ignores progress values. Progress-bar mode (5) stays running until the caller closes it, matching Skyrim PPSA03747's save sequence; other modes still finish immediately and return button 1 and the first nonempty directory name. Console dialog timing and selection behavior remain unverified.
+- [libSceSaveDataDialog.native](../../../core/libs/prx/libSceSaveDataDialog.native/Export.cpp) shows no UI and ignores progress values. Progress-bar mode (5) stays running until the caller closes it, matching Skyrim PPSA03747's save sequence; other modes still finish immediately and return button 1 and the first nonempty directory name. Console dialog timing and selection behavior remain unverified. Lifecycle state error codes follow shadPS4: `sceSaveDataDialogClose` returns `SAVE_DATA_DIALOG_ERROR_NOT_RUNNING` whenever not running, `sceSaveDataDialogGetResult` returns `SAVE_DATA_DIALOG_ERROR_NOT_FINISHED` whenever not finished (checked before null pointer), and `sceSaveDataDialogTerminate` closes running dialogs and returns OK, rejecting uninitialized calls with `SAVE_DATA_DIALOG_ERROR_NOT_INITIALIZED`.