diff --git a/src/app/(protected)/team-members/_components/add-team-member-dialog.tsx b/src/app/(protected)/team-members/_components/add-team-member-dialog.tsx
index 170f3ccf..ef9064df 100644
--- a/src/app/(protected)/team-members/_components/add-team-member-dialog.tsx
+++ b/src/app/(protected)/team-members/_components/add-team-member-dialog.tsx
@@ -1,4 +1,4 @@
-import { useEffect, useMemo, useState, type Dispatch, type SetStateAction } from "react";
+import { useEffect, useMemo, useRef, useState, type Dispatch, type SetStateAction } from "react";
 import {
   Accordion,
   AccordionDetails,
@@ -278,15 +278,25 @@ export function TeamMemberFormFields({
 export function AddTeamMemberDialog({ open, onClose }: { open: boolean; onClose: () => void }) {
   const [form, setForm] = useState(emptyForm);
   const [submitted, setSubmitted] = useState(false);
-  const createTeamMember = useCreateTeamMember();
-  const mutationError = createTeamMember.error;
+  const submissionId = useRef(0);
+  const { error: mutationError, isPending, mutate, reset } = useCreateTeamMember();
 
   useEffect(() => {
+    submissionId.current += 1;
+    reset();
     if (open) {
       setForm(emptyForm());
       setSubmitted(false);
     }
-  }, [open]);
+  }, [open, reset]);
+
+  const handleClose = () => {
+    if (isPending) return;
+
+    submissionId.current += 1;
+    reset();
+    onClose();
+  };
 
   const emailIsValid = /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(form.email.trim());
   const errors = useMemo(
@@ -340,11 +350,18 @@ export function AddTeamMemberDialog({ open, onClose }: { open: boolean; onClose:
       serviceAreas: form.serviceAreas,
       permissionOverrides: permissionOverrides(form.role, form.permissions),
     };
-    createTeamMember.mutate(input, { onSuccess: onClose });
+    const currentSubmissionId = submissionId.current;
+    mutate(input, {
+      onSuccess: () => {
+        if (submissionId.current !== currentSubmissionId) return;
+        reset();
+        onClose();
+      },
+    });
   };
 
   return (
-    <Dialog open={open} onClose={onClose} fullWidth maxWidth="md" scroll="paper">
+    <Dialog open={open} onClose={handleClose} fullWidth maxWidth="md" scroll="paper">
       <DialogTitle>Add Member</DialogTitle>
       <DialogContent dividers>
         <Typography color="text.secondary" sx={{ mb: 3 }}>
@@ -365,15 +382,11 @@ export function AddTeamMemberDialog({ open, onClose }: { open: boolean; onClose:
         />
       </DialogContent>
       <DialogActions>
-        <Button onClick={onClose} disabled={createTeamMember.isPending}>
+        <Button onClick={handleClose} disabled={isPending}>
           Cancel
         </Button>
-        <Button variant="contained" onClick={submit} disabled={createTeamMember.isPending}>
-          {createTeamMember.isPending ? (
-            <CircularProgress size={20} color="inherit" />
-          ) : (
-            "Add Member"
-          )}
+        <Button variant="contained" onClick={submit} disabled={isPending}>
+          {isPending ? <CircularProgress size={20} color="inherit" /> : "Add Member"}
         </Button>
       </DialogActions>
     </Dialog>
diff --git a/src/test/app/(protected)/team-members/add-team-member-dialog.test.tsx b/src/test/app/(protected)/team-members/add-team-member-dialog.test.tsx
index c88dfb56..8bd47668 100644
--- a/src/test/app/(protected)/team-members/add-team-member-dialog.test.tsx
+++ b/src/test/app/(protected)/team-members/add-team-member-dialog.test.tsx
@@ -11,11 +11,14 @@ vi.mock("@/domain/team-members/use-cases/use-create-team-member", () => ({
 
 describe("AddTeamMemberDialog", () => {
   const mutate = vi.fn();
+  const reset = vi.fn();
 
   beforeEach(() => {
     mutate.mockReset();
+    reset.mockReset();
     vi.mocked(useCreateTeamMember).mockReturnValue({
       mutate,
+      reset,
       isPending: false,
       error: null,
     } as unknown as ReturnType<typeof useCreateTeamMember>);
@@ -62,4 +65,40 @@ describe("AddTeamMemberDialog", () => {
       expect.any(Object),
     );
   }, 15000);
+
+  it("does not close while a member is being created", async () => {
+    const user = userEvent.setup();
+    const onClose = vi.fn();
+    vi.mocked(useCreateTeamMember).mockReturnValue({
+      mutate,
+      reset,
+      isPending: true,
+      error: null,
+    } as unknown as ReturnType<typeof useCreateTeamMember>);
+    renderWithProviders(<AddTeamMemberDialog open onClose={onClose} />, { withAuth: false });
+
+    await user.keyboard("{Escape}");
+
+    expect(onClose).not.toHaveBeenCalled();
+  });
+
+  it("clears a previous mutation error when reopened", () => {
+    const mutation = {
+      mutate,
+      reset,
+      isPending: false,
+      error: new Error("Email is already in use."),
+    } as unknown as ReturnType<typeof useCreateTeamMember>;
+    vi.mocked(useCreateTeamMember).mockReturnValue(mutation);
+    const { rerender } = renderWithProviders(<AddTeamMemberDialog open onClose={vi.fn()} />, {
+      withAuth: false,
+    });
+
+    expect(screen.getByText("Email is already in use.")).toBeInTheDocument();
+    mutation.error = null;
+    rerender(<AddTeamMemberDialog open={false} onClose={vi.fn()} />);
+    rerender(<AddTeamMemberDialog open onClose={vi.fn()} />);
+
+    expect(screen.queryByText("Email is already in use.")).not.toBeInTheDocument();
+  });
 });