diff --git a/src/core/devices/wwan/nm-device-modem.c b/src/core/devices/wwan/nm-device-modem.c
index 80691bf97..4a0d9e443 100644
--- a/src/core/devices/wwan/nm-device-modem.c
+++ b/src/core/devices/wwan/nm-device-modem.c
@@ -170,7 +170,10 @@ modem_new_config(NMModem                  *modem,
     NMDeviceModemPrivate *priv    = NM_DEVICE_MODEM_GET_PRIVATE(self);
     NMDevice             *device  = NM_DEVICE(self);
 
-    g_return_if_fail(nm_device_devip_get_state(device, addr_family) == NM_DEVICE_IP_STATE_PENDING);
+    if (nm_device_devip_get_state(device, addr_family) != NM_DEVICE_IP_STATE_PENDING) {
+        _LOGD(LOGD_MB, "retrieving IP configuration while no longer in pending state");
+        return;
+    }
 
     if (error) {
         _LOGW(LOGD_MB, "retrieving IP configuration failed: %s", error->message);
diff --git a/src/core/devices/wwan/nm-modem.c b/src/core/devices/wwan/nm-modem.c
index 225eaa650..a5ee8ce8e 100644
--- a/src/core/devices/wwan/nm-modem.c
+++ b/src/core/devices/wwan/nm-modem.c
@@ -650,6 +650,10 @@ _ppp_mgr_callback(NMPppMgr *ppp_mgr, const NMPppMgrCallbackData *callback_data,
                      * We will emit it together with stage3. */
                     continue;
                 }
+                if (priv->ip_data_x[IS_IPv4].stage3_on_idle_source) {
+                    /* We scheduled already a handler. Let it handle the new configuration. */
+                    continue;
+                }
                 if (callback_data->data.ip_changed_x[IS_IPv4])
                     _ppp_maybe_emit_new_config(self, IS_IPv4 ? AF_INET : AF_INET6);
             }