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src/components/OnlinePrinterIcons.jsx

@@ -186,7 +186,7 @@ export default class OnlinePrinterIcons extends PureComponent {
             gap: { xs: 0.5, lg: 1 },
           }}
         >
-          {onlinePrinters.map((p) => {
+          {onlinePrinters.map((p, index) => {
             const hasError = Boolean(
               p.error || p.open || p.live?.errors?.other || p.live?.errors?.headOpen,
             );
@@ -203,7 +203,9 @@ export default class OnlinePrinterIcons extends PureComponent {
 
             return (
               <IconButton
+                key={p.id || p.serial || index}
                 onClick={(e) => this.handleOpenMenu(e, p)}
+                title={tooltipTitle}
                 sx={(theme) => ({
                   p: 0,
                   width: 32,

src/components/article/tabs/ArticleLabelTab.jsx

@@ -201,7 +201,7 @@ export default class ArticleLabelTab extends PureComponent {
             {templates.map((t) => {
               const isSelected = t.id === selectedTemplateId;
               return (
-                <Grid item xs={12} sm={6} md={4} key={t.id}>
+                <Grid size={{ xs: 12, sm: 6, md: 4 }} key={t.id}>
                   <Paper
                     variant="outlined"
                     onClick={() => this.setState({ selectedTemplateId: t.id })}