diff --git a/CHANGELOG.md b/CHANGELOG.md
index 62122ce4..bd7a59dc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -15,6 +15,14 @@ a version is cut.
 
 ### Fixed
 
+- **One confirmation message instead of two.** Saving a new client, system user or role showed the
+  same green "Client created." twice, stacked. So did deleting one. It was only ever cosmetic —
+  nothing happened twice — but it read as though something had, which is the last thing a
+  confirmation should do. Saves that stay on the same screen, such as the email settings, were never
+  affected.
+  ([#1675](https://github.com/projectsend/projectsend/issues/1675), reported and diagnosed by
+  [@denkfabrik-li](https://github.com/denkfabrik-li))
+
 - **Connecting a provider to an account that already has one.** Signing in with Google, Microsoft or
   a custom provider worked, but attaching one to an existing account did not: the **Connect** button
   on Settings → Connected accounts appeared to do nothing at all. The button asks the server in the
diff --git a/resources/js/components/toaster.tsx b/resources/js/components/toaster.tsx
index 0dbf8ae3..ef2523f5 100644
--- a/resources/js/components/toaster.tsx
+++ b/resources/js/components/toaster.tsx
@@ -15,11 +15,26 @@ interface Toast {
 
 const DURATION = 4500;
 
+/**
+ * The flash object most recently turned into toasts, across remounts.
+ *
+ * Both of the component's sources can hand over the *same* visit's flash:
+ * the layout (and the Toaster inside it) remounts whenever a flashed
+ * redirect lands on a different page component — create → edit, delete →
+ * index — and then the mount-time read and the router `success` event
+ * each fire once for one flash, stacking every "Client created." twice.
+ * Identity comparison is the dedup that cannot over-trigger: a repeat of
+ * the same action produces an identical *message* but never the identical
+ * *object*, so deliberate back-to-back toasts still both show.
+ */
+let shownFlash: SharedData['flash'] | null = null;
+
 /**
  * App-wide flash toasts. Reads the `flash` shared prop and shows a toast
  * after any Inertia visit that carried one (created/updated/deleted…).
  * Uses the router `success` event so two identical messages in a row still
- * each toast. Mounted once in the app layout.
+ * each toast. Mounted in the app layout, which remounts it — see the note on
+ * `shownFlash` above.
  */
 export function Toaster() {
     const { t } = useTranslation();
@@ -36,16 +51,20 @@ export function Toaster() {
 
     const dismiss = (id: number) => setToasts((current) => current.filter((toast) => toast.id !== id));
 
+    const pushFlash = (flash: SharedData['flash'] | null | undefined) => {
+        if (!flash || flash === shownFlash) return;
+        shownFlash = flash;
+        push('success', flash.success);
+        push('error', flash.error);
+    };
+
     useEffect(() => {
         // A flash present on the very first render (e.g. a server redirect on load).
-        push('success', page.props.flash?.success);
-        push('error', page.props.flash?.error);
+        pushFlash(page.props.flash);
 
         // And every subsequent successful visit.
         const stop = router.on('success', (event) => {
-            const flash = (event.detail.page.props as unknown as SharedData).flash;
-            push('success', flash?.success);
-            push('error', flash?.error);
+            pushFlash((event.detail.page.props as unknown as SharedData).flash);
         });
 
         return () => stop();