diff --git a/lni.cls b/lni.cls
index b900c39..7bab59b 100644
--- a/lni.cls
+++ b/lni.cls
@@ -380,9 +380,9 @@
 \newcommand{\@multiaffil}[1]{%
    \ifcsundef{@emailsandorcids#1}{\csgdef{@emailsandorcids#1}{}}{}%
    \ifcsempty{@emailsandorcids#1}%
-   {\csgappto{@emailsandorcids#1}{%
+   {\protected@csxappto{@emailsandorcids#1}{%
          \if\relax\@currEmail\relax\else\email{\@currEmail}\fi\if\relax\@currOrcid\relax\else,\ \orcid{\@currOrcid}\fi}}%
-   {\csgappto{@emailsandorcids#1}{%
+   {\protected@csxappto{@emailsandorcids#1}{%
          \if\relax\@currEmail\relax\else;\ \email{\@currEmail}\fi\if\relax\@currOrcid\relax\else,\ \orcid{\@currOrcid}\fi}}%
 }
 
diff --git a/lni.dtx b/lni.dtx
index c98e055..27d0bd1 100644
--- a/lni.dtx
+++ b/lni.dtx
@@ -1160,9 +1160,9 @@ This work consists of the file  lni.dtx
 \newcommand{\@multiaffil}[1]{%
    \ifcsundef{@emailsandorcids#1}{\csgdef{@emailsandorcids#1}{}}{}%
    \ifcsempty{@emailsandorcids#1}%
-   {\csgappto{@emailsandorcids#1}{%
+   {\protected@csxappto{@emailsandorcids#1}{%
          \if\relax\@currEmail\relax\else\email{\@currEmail}\fi\if\relax\@currOrcid\relax\else,\ \orcid{\@currOrcid}\fi}}%
-   {\csgappto{@emailsandorcids#1}{%
+   {\protected@csxappto{@emailsandorcids#1}{%
          \if\relax\@currEmail\relax\else;\ \email{\@currEmail}\fi\if\relax\@currOrcid\relax\else,\ \orcid{\@currOrcid}\fi}}%
 }