diff --git a/src/venues/near-intents/solver-relay-ws.mjs b/src/venues/near-intents/solver-relay-ws.mjs
index 2c726d6..fe32444 100644
--- a/src/venues/near-intents/solver-relay-ws.mjs
+++ b/src/venues/near-intents/solver-relay-ws.mjs
@@ -22,6 +22,7 @@ export async function startSolverRelayWs({
   let lastConnectedAt = null;
   let lastDisconnectedAt = null;
   let lastReconnectAt = null;
+  const closingSockets = new WeakSet();
 
   connect();
 
@@ -202,9 +203,11 @@ export async function startSolverRelayWs({
   }
 
   function closeSocket() {
-    if (!socket || socket.readyState > WebSocket.OPEN) return;
+    const activeSocket = socket;
+    if (!activeSocket || activeSocket.readyState > WebSocket.OPEN || closingSockets.has(activeSocket)) return;
+    closingSockets.add(activeSocket);
     try {
-      socket.close();
+      activeSocket.close();
     } catch (error) {
       logger?.warn('socket_close_failed', {
         venue: 'near-intents',
diff --git a/test/solver-relay-ws.test.mjs b/test/solver-relay-ws.test.mjs
index 76063c5..2623802 100644
--- a/test/solver-relay-ws.test.mjs
+++ b/test/solver-relay-ws.test.mjs
@@ -23,6 +23,8 @@ function installMockWebSocket() {
       this.readyState = MockWebSocket.CONNECTING;
       this.sent = [];
       this.listeners = new Map();
+      this.closeCalls = 0;
+      this.emitErrorDuringClose = false;
       instances.push(this);
     }
 
@@ -37,7 +39,11 @@ function installMockWebSocket() {
     }
 
     close() {
+      this.closeCalls += 1;
       if (this.readyState === MockWebSocket.CLOSED) return;
+      if (this.emitErrorDuringClose) {
+        this.emit('error', new Error('socket failed while closing'));
+      }
       this.readyState = MockWebSocket.CLOSED;
       this.emit('close', {});
     }
@@ -112,6 +118,34 @@ test('solver relay reconnects after websocket error even when no close event is
   }
 });
 
+test('solver relay websocket close is reentrant-safe when close emits an error', async () => {
+  const mock = installMockWebSocket();
+  const client = await startSolverRelayWs({
+    apiKey: 'api-key',
+    wsUrl: 'wss://relay.example/ws',
+    reconnectDelayMs: 1,
+  });
+
+  try {
+    assert.equal(mock.instances.length, 1);
+    mock.instances[0].open();
+    mock.instances[0].emitErrorDuringClose = true;
+
+    assert.doesNotThrow(() => {
+      mock.instances[0].error(new Error('network failed'));
+    });
+    await delay(10);
+
+    assert.equal(mock.instances[0].closeCalls, 1);
+    assert.equal(client.getState().connected, false);
+    assert.ok(client.getState().reconnect_count >= 2);
+    assert.ok(mock.instances.length >= 2);
+  } finally {
+    client.close();
+    mock.restore();
+  }
+});
+
 test('solver relay sends queued request after connection and resolves rpc result', async () => {
   const mock = installMockWebSocket();
   const client = await startSolverRelayWs({