diff --git a/src/applications/doorkeeper/bridge/DoorkeeperBridge.php b/src/applications/doorkeeper/bridge/DoorkeeperBridge.php
--- a/src/applications/doorkeeper/bridge/DoorkeeperBridge.php
+++ b/src/applications/doorkeeper/bridge/DoorkeeperBridge.php
@@ -48,4 +48,32 @@
     return null;
   }
 
+  final protected function saveExternalObject(
+    DoorkeeperObjectRef $ref,
+    DoorkeeperExternalObject $obj) {
+
+    $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
+      try {
+        $obj->save();
+      } catch (AphrontDuplicateKeyQueryException $ex) {
+
+        // In various cases, we may race another process importing the same
+        // data. If we do, we'll collide on the object key. Load the object
+        // the other process created and use that.
+        $obj = id(new DoorkeeperExternalObjectQuery())
+          ->setViewer($this->getViewer())
+          ->withObjectKeys(array($ref->getObjectKey()))
+          ->executeOne();
+        if (!$obj) {
+          throw new PhutilProxyException(
+            pht('Failed to load external object after collision.'),
+            $ex);
+        }
+
+        $ref->attachExternalObject($obj);
+      }
+    unset($unguarded);
+  }
+
+
 }
diff --git a/src/applications/doorkeeper/bridge/DoorkeeperBridgeAsana.php b/src/applications/doorkeeper/bridge/DoorkeeperBridgeAsana.php
--- a/src/applications/doorkeeper/bridge/DoorkeeperBridgeAsana.php
+++ b/src/applications/doorkeeper/bridge/DoorkeeperBridgeAsana.php
@@ -113,10 +113,7 @@
       }
 
       $this->fillObjectFromData($obj, $result);
-
-      $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
-        $obj->save();
-      unset($unguarded);
+      $this->saveExternalObject($ref, $obj);
     }
   }
 
diff --git a/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubIssue.php b/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubIssue.php
--- a/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubIssue.php
+++ b/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubIssue.php
@@ -78,10 +78,7 @@
       $obj = $ref->getExternalObject();
 
       $this->fillObjectFromData($obj, $result);
-
-      $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
-        $obj->save();
-      unset($unguarded);
+      $this->saveExternalObject($ref, $obj);
     }
   }
 
diff --git a/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubUser.php b/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubUser.php
--- a/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubUser.php
+++ b/src/applications/doorkeeper/bridge/DoorkeeperBridgeGitHubUser.php
@@ -101,10 +101,7 @@
 
       $obj = $ref->getExternalObject();
       $this->fillObjectFromData($obj, $spec);
-
-      $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
-        $obj->save();
-      unset($unguarded);
+      $this->saveExternalObject($ref, $obj);
     }
   }
 
diff --git a/src/applications/doorkeeper/bridge/DoorkeeperBridgeJIRA.php b/src/applications/doorkeeper/bridge/DoorkeeperBridgeJIRA.php
--- a/src/applications/doorkeeper/bridge/DoorkeeperBridgeJIRA.php
+++ b/src/applications/doorkeeper/bridge/DoorkeeperBridgeJIRA.php
@@ -104,10 +104,7 @@
       }
 
       $this->fillObjectFromData($obj, $result);
-
-      $unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
-        $obj->save();
-      unset($unguarded);
+      $this->saveExternalObject($ref, $obj);
     }
   }