diff --git a/src/Runtime/Runner.php b/src/Runtime/Runner.php
index bb044ee..df53c9c 100644
--- a/src/Runtime/Runner.php
+++ b/src/Runtime/Runner.php
@@ -52,7 +52,11 @@ public function __construct(StreamFactory $streamFactory)
     public function attach(StreamContainerInterface $streamContainer, Closure $onSelect, string $identity): void
     {
         if (array_key_exists($identity, $this->containers)) {
-            throw new RunnerException("Stream container with identity {$identity} already attached");
+            // On repeated identity, check if actually readable (detach if not)
+            if ($this->containers[$identity]->stream->isReadable()) {
+                throw new RunnerException("Stream container with identity {$identity} already attached");
+            }
+            $this->detach($identity);
         }
         $stream = $streamContainer->getStream();
         $this->streamCollection->attach($stream, $identity);
diff --git a/tests/suites/runtime/RunnerTest.php b/tests/suites/runtime/RunnerTest.php
index d55786b..cdb95db 100644
--- a/tests/suites/runtime/RunnerTest.php
+++ b/tests/suites/runtime/RunnerTest.php
@@ -62,6 +62,36 @@ public function testHandling(): void
         $runner->detach($streamContainer->getIdentity());
     }
 
+    public function testIdentityConflictResolvable(): void
+    {
+        $this->expectStreamFactory();
+        $factory = new StreamFactory();
+        $this->expectStreamFactoryCreateStreamCollection();
+        $this->expectStreamCollection();
+        $runner = new Runner($factory);
+
+        $this->expectStreamFactoryCreateStream();
+        $this->expectStreamFactoryCreateStreamFromResource();
+        $this->expectStream();
+        $this->expectStreamGetMetadata();
+        $this->expectContext();
+        $streamContainer = new MockStreamContainer($factory);
+
+        $this->expectStreamCollectionAttach();
+        $runner->attach($streamContainer, function () {
+            // ignore
+        }, $streamContainer->getIdentity());
+
+        $this->expectStreamIsReadable()->setReturn(function () {
+            return false;
+        });
+        $this->expectStreamCollectionDetach();
+        $this->expectStreamCollectionAttach();
+        $runner->attach($streamContainer, function () {
+            // ignore
+        }, $streamContainer->getIdentity());
+    }
+
     public function testIdentityConflict(): void
     {
         $this->expectStreamFactory();
@@ -81,6 +111,10 @@ public function testIdentityConflict(): void
         $runner->attach($streamContainer, function () {
             // ignore
         }, $streamContainer->getIdentity());
+
+        $this->expectStreamIsReadable()->setReturn(function () {
+            return true;
+        });
         $this->expectException(RunnerException::class);
         $this->expectExceptionMessage('Stream container with identity mock-stream-container already attached');
         $runner->attach($streamContainer, function () {