credui: The pUIInfo parameter is optional to CredUIPromptForCredentials, so check before dereferencing it to get the parent window.
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@ -212,7 +212,8 @@ DWORD WINAPI CredUIPromptForCredentialsW(PCREDUI_INFOW pUIInfo,
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params.fSave = pfSave ? *pfSave : FALSE;
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ret = DialogBoxParamW(hinstCredUI, MAKEINTRESOURCEW(IDD_CREDDIALOG),
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pUIInfo->hwndParent, CredDialogProc, (LPARAM)¶ms);
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pUIInfo ? pUIInfo->hwndParent : NULL,
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CredDialogProc, (LPARAM)¶ms);
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if (ret <= 0)
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return GetLastError();
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