diff --git a/__test__/components/EventErrorHandling.test.tsx b/__test__/components/EventErrorHandling.test.tsx
new file mode 100644
index 0000000..f08e8d1
--- /dev/null
+++ b/__test__/components/EventErrorHandling.test.tsx
@@ -0,0 +1,96 @@
+import { act, fireEvent, screen, waitFor } from "@testing-library/react";
+import { renderWithProviders } from "../utils/Renderwithproviders";
+import CalendarLayout from "../../src/components/Calendar/CalendarLayout";
+
+describe("Event Error Handling", () => {
+  beforeEach(() => {
+    localStorage.clear();
+    jest.clearAllMocks();
+  });
+
+  const today = new Date();
+  const start = new Date(today);
+  start.setHours(10, 0, 0, 0);
+  const end = new Date(today);
+  end.setHours(11, 0, 0, 0);
+
+  const erroredState = {
+    user: {
+      userData: {
+        sub: "test",
+        email: "test@test.com",
+        sid: "mockSid",
+        openpaasId: "user1",
+      },
+      tokens: { accessToken: "token" },
+    },
+    calendars: {
+      list: {
+        "user1/cal1": {
+          name: "Calendar personal",
+          id: "user1/cal1",
+          color: { light: "#FF0000", dark: "#000" },
+          ownerEmails: ["alice@example.com"],
+          events: {
+            event1: {
+              id: "event1",
+              calId: "user1/cal1",
+              uid: "event1",
+              title: "Test Event",
+              start: start.toISOString(),
+              end: start.toISOString(),
+              partstat: "ACCEPTED",
+              organizer: {
+                cn: "Alice",
+                cal_address: "alice@example.com",
+              },
+              attendee: [
+                {
+                  cn: "Alice",
+                  partstat: "ACCEPTED",
+                  rsvp: "TRUE",
+                  role: "REQ-PARTICIPANT",
+                  cutype: "INDIVIDUAL",
+                  cal_address: "alice@example.com",
+                },
+              ],
+            },
+          },
+        },
+      },
+      pending: false,
+    },
+  };
+
+  it("BUGFIX: does not re-report errors after clearing error snackbar", async () => {
+    const consoleWarnSpy = jest.spyOn(console, "warn").mockImplementation();
+
+    await act(async () =>
+      renderWithProviders(<CalendarLayout />, erroredState)
+    );
+
+    await waitFor(() => {
+      expect(screen.getByText("Test Event"));
+      expect(screen.getByRole("alert")).toBeInTheDocument();
+    });
+    const closeButton = screen.queryByRole("button", { name: "common.ok" });
+
+    if (closeButton) {
+      const initialWarnCount = consoleWarnSpy.mock.calls.length;
+
+      await act(async () => {
+        fireEvent.click(closeButton);
+      });
+
+      await waitFor(() => {
+        expect(screen.queryByRole("alert")).not.toBeInTheDocument();
+      });
+
+      const afterCloseWarnCount = consoleWarnSpy.mock.calls.length;
+
+      expect(afterCloseWarnCount).toBe(initialWarnCount);
+    }
+
+    consoleWarnSpy.mockRestore();
+  });
+});
diff --git a/src/components/Error/EventErrorHandler.ts b/src/components/Error/EventErrorHandler.ts
index f2f2082..fd47839 100644
--- a/src/components/Error/EventErrorHandler.ts
+++ b/src/components/Error/EventErrorHandler.ts
@@ -1,5 +1,6 @@
 export class EventErrorHandler {
   private errors = new Map<string, string>();
+  private reportedEvents = new Set<string>();
   private onErrorCallback?: (messages: string[]) => void;
 
   setErrorCallback(callback: (messages: string[]) => void) {
@@ -7,7 +8,8 @@ export class EventErrorHandler {
   }
 
   reportError(eventId: string, message: string) {
-    if (!this.errors.has(eventId)) {
+    if (!this.reportedEvents.has(eventId)) {
+      this.reportedEvents.add(eventId);
       this.errors.set(eventId, message);
       console.warn(`[EventErrorHandler] ${eventId}: ${message}`);
       this.emit();
diff --git a/src/components/Event/EventChip/ErrorEventChip.tsx b/src/components/Event/EventChip/ErrorEventChip.tsx
index 58219f7..144ea0a 100644
--- a/src/components/Event/EventChip/ErrorEventChip.tsx
+++ b/src/components/Event/EventChip/ErrorEventChip.tsx
@@ -1,5 +1,5 @@
-import React from "react";
 import { Card, Typography } from "@mui/material";
+import { useRef, useEffect } from "react";
 import { EventErrorHandler } from "../../Error/EventErrorHandler";
 
 export function ErrorEventChip({
@@ -11,9 +11,21 @@ export function ErrorEventChip({
   errorHandler: EventErrorHandler;
   error: any;
 }) {
-  const message =
-    error instanceof Error ? error.message : "Unknown error during rendering";
-  errorHandler.reportError(event._def.extendedProps.uid || event.id, message);
+  const hasReported = useRef(false);
+
+  useEffect(() => {
+    if (!hasReported.current) {
+      const message =
+        error instanceof Error
+          ? error.message
+          : `${error.class} error during rendering ${event._def.extendedProps.uid || event.id}`;
+      errorHandler.reportError(
+        event._def.extendedProps.uid || event.id,
+        message
+      );
+      hasReported.current = true;
+    }
+  }, [event, errorHandler, error]);
 
   return (
     <Card