fix(whatsapp): guard get_me() calls to enable QR pairing on fresh sessions

core/clients/whatsapp.py

@@ -159,6 +159,10 @@ class WhatsAppClient(ClientBase):
             db_dir = os.path.dirname(self.session_db)
             if db_dir:
                 os.makedirs(db_dir, exist_ok=True)
+            if db_dir and not os.access(db_dir, os.W_OK):
+                raise PermissionError(
+                    f"session db directory is not writable: {db_dir}"
+                )
         except Exception as exc:
             self._publish_state(
                 connected=False,
@@ -179,6 +183,19 @@ class WhatsAppClient(ClientBase):
             )
             return
 
+        if not self._session_has_device():
+            self._publish_state(
+                connected=False,
+                warning="No linked WhatsApp device. Waiting for QR pairing.",
+                accounts=[],
+                last_event="no_linked_device",
+                pair_status="needs_pairing",
+            )
+            self.log.info(
+                "whatsapp session db has no linked device — connect will "
+                "start QR pairing flow"
+            )
+
         self._register_event_handlers(wa_events)
 
         try:
@@ -457,6 +474,32 @@ class WhatsAppClient(ClientBase):
             )
             return None
 
+    def _session_has_device(self):
+        """Check whatsmeow_device table for a linked device row.
+
+        Neonize's Go layer panics (SIGSEGV in GetMe) when connect() is called
+        on a session with no linked device.  Querying the SQLite schema directly
+        lets us skip connect() and avoid crashing the entire UR process.
+        """
+        if not os.path.exists(self.session_db):
+            return False
+        try:
+            conn = sqlite3.connect(self.session_db)
+            cursor = conn.cursor()
+            cursor.execute(
+                "SELECT COUNT(*) FROM sqlite_master "
+                "WHERE type='table' AND name='whatsmeow_device'"
+            )
+            if cursor.fetchone()[0] == 0:
+                conn.close()
+                return False
+            cursor.execute("SELECT COUNT(*) FROM whatsmeow_device")
+            count = cursor.fetchone()[0]
+            conn.close()
+            return count > 0
+        except Exception:
+            return False
+
     def _register_event_handlers(self, wa_events):
         connected_ev = getattr(wa_events, "ConnectedEv", None)
         message_ev = getattr(wa_events, "MessageEv", None)
@@ -1361,6 +1404,11 @@ class WhatsAppClient(ClientBase):
             return ""
         if not hasattr(self._client, "get_me"):
             return self.client_name
+        # Guard: Neonize Go GetMe() panics (SIGSEGV) when cli.LID is nil
+        # on unlinked sessions.  Only safe to call after pairing completes
+        # and the device row exists in the whatsmeow_device table.
+        if not self._session_has_device():
+            return self.client_name
         try:
             me = await self._maybe_await(self._client.get_me())
         except Exception:
@@ -1785,7 +1833,8 @@ class WhatsAppClient(ClientBase):
             self._connected = True
             self._publish_state(connected=True, warning="", pair_status="connected")
             return True
-        if hasattr(self._client, "get_me"):
+        # Guard: Neonize Go GetMe() panics (SIGSEGV) on unlinked sessions.
+        if hasattr(self._client, "get_me") and self._session_has_device():
             try:
                 me = await self._maybe_await(self._client.get_me())
                 if me: