diff --git a/itou/openid_connect/inclusion_connect/models.py b/itou/openid_connect/inclusion_connect/models.py
index 99e7e474e9..e64416e4ef 100644
--- a/itou/openid_connect/inclusion_connect/models.py
+++ b/itou/openid_connect/inclusion_connect/models.py
@@ -19,13 +19,10 @@ class InclusionConnectState(OIDConnectState):
 
 
 @dataclasses.dataclass
-class InclusionConnectPrescriberData(OIDConnectUserData):
-    kind: UserKind = UserKind.PRESCRIBER
-    identity_provider: IdentityProvider = IdentityProvider.INCLUSION_CONNECT
-    login_allowed_user_kinds: ClassVar[tuple[UserKind]] = (UserKind.PRESCRIBER, UserKind.EMPLOYER)
-    allowed_identity_provider_migration: ClassVar[tuple[IdentityProvider]] = (IdentityProvider.DJANGO,)
-
+class InclusionConnectUserData(OIDConnectUserData):
     def join_org(self, user: User, safir: str):
+        if not user.is_prescriber:
+            raise ValueError("Invalid user kind: %s", user.kind)
         try:
             organization = PrescriberOrganization.objects.get(code_safir_pole_emploi=safir)
         except PrescriberOrganization.DoesNotExist:
@@ -36,7 +33,15 @@ def join_org(self, user: User, safir: str):
 
 
 @dataclasses.dataclass
-class InclusionConnectEmployerData(OIDConnectUserData):
+class InclusionConnectPrescriberData(InclusionConnectUserData):
+    kind: UserKind = UserKind.PRESCRIBER
+    identity_provider: IdentityProvider = IdentityProvider.INCLUSION_CONNECT
+    login_allowed_user_kinds: ClassVar[tuple[UserKind]] = (UserKind.PRESCRIBER, UserKind.EMPLOYER)
+    allowed_identity_provider_migration: ClassVar[tuple[IdentityProvider]] = (IdentityProvider.DJANGO,)
+
+
+@dataclasses.dataclass
+class InclusionConnectEmployerData(InclusionConnectUserData):
     kind: UserKind = UserKind.EMPLOYER
     identity_provider: IdentityProvider = IdentityProvider.INCLUSION_CONNECT
     login_allowed_user_kinds: ClassVar[tuple[UserKind]] = (UserKind.PRESCRIBER, UserKind.EMPLOYER)
diff --git a/itou/openid_connect/inclusion_connect/views.py b/itou/openid_connect/inclusion_connect/views.py
index 1df6b0d5d6..f6f7d73b04 100644
--- a/itou/openid_connect/inclusion_connect/views.py
+++ b/itou/openid_connect/inclusion_connect/views.py
@@ -317,7 +317,7 @@ def inclusion_connect_callback(request):
 
     code_safir_pole_emploi = user_data.get("structure_pe")
     # Only handle user creation for the moment, not updates.
-    if is_successful and code_safir_pole_emploi:
+    if is_successful and user.is_prescriber and code_safir_pole_emploi:
         try:
             ic_user_data.join_org(user=user, safir=code_safir_pole_emploi)
         except PrescriberOrganization.DoesNotExist:
diff --git a/tests/openid_connect/inclusion_connect/tests.py b/tests/openid_connect/inclusion_connect/tests.py
index af5d1b0491..dea5a018ed 100644
--- a/tests/openid_connect/inclusion_connect/tests.py
+++ b/tests/openid_connect/inclusion_connect/tests.py
@@ -593,6 +593,32 @@ def test_callback_update_FT_organization(self):
         )
         self.assertQuerySetEqual(org.members.all(), [user])
 
+    @respx.mock
+    def test_callback_update_FT_organization_as_employer_does_not_crash(self):
+        org = PrescriberPoleEmploiFactory(code_safir_pole_emploi=OIDC_USERINFO_FT_WITH_SAFIR["structure_pe"])
+        mock_oauth_dance(
+            self.client,
+            UserKind.EMPLOYER,
+            oidc_userinfo=OIDC_USERINFO_FT_WITH_SAFIR.copy(),
+        )
+        user = get_user(self.client)
+        assert user.is_authenticated
+        assert not user.prescribermembership_set.exists()
+
+        # If he's a prescriber and uses the employer login button
+        user.kind = UserKind.PRESCRIBER
+        user.save()
+        self.client.logout()
+        mock_oauth_dance(
+            self.client,
+            UserKind.EMPLOYER,
+            oidc_userinfo=OIDC_USERINFO_FT_WITH_SAFIR.copy(),
+            register=False,
+        )
+        user = get_user(self.client)
+        assert user.is_authenticated
+        self.assertQuerySetEqual(org.members.all(), [user])
+
     @respx.mock
     def test_callback_ft_users_with_no_org(self):
         PrescriberFactory(**dataclasses.asdict(InclusionConnectPrescriberData.from_user_info(OIDC_USERINFO)))