diff --git a/.changes/barcode-scanner-ios-cancel-main-thread.md b/.changes/barcode-scanner-ios-cancel-main-thread.md
new file mode 100644
index 000000000..5b4930a5b
--- /dev/null
+++ b/.changes/barcode-scanner-ios-cancel-main-thread.md
@@ -0,0 +1,6 @@
+---
+"barcode-scanner": patch
+"barcode-scanner-js": patch
+---
+
+Fixed a crash on iOS when `cancel()` is invoked by running the cancel handler on the main thread.
diff --git a/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift b/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift
index 545eb9f4d..96996cabe 100644
--- a/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift
+++ b/plugins/barcode-scanner/ios/Sources/BarcodeScannerPlugin.swift
@@ -337,10 +337,11 @@ class BarcodeScannerPlugin: Plugin, AVCaptureMetadataOutputObjectsDelegate {
   }
 
   @objc private func cancel(_ invoke: Invoke) {
-    self.invoke?.reject("cancelled")
-
-    destroy()
-    invoke.resolve()
+    DispatchQueue.main.async { [self] in
+      self.invoke?.reject("cancelled")
+      self.destroy()
+      invoke.resolve()
+    }
   }
 }