diff --git a/usb/gadget/aidl/default/UsbGadget.cpp b/usb/gadget/aidl/default/UsbGadget.cpp
index 72cf681..51f7f5b 100644
--- a/usb/gadget/aidl/default/UsbGadget.cpp
+++ b/usb/gadget/aidl/default/UsbGadget.cpp
@@ -91,6 +91,9 @@
 
 ScopedAStatus UsbGadget::getCurrentUsbFunctions(const shared_ptr<IUsbGadgetCallback>& callback,
                                                 int64_t in_transactionId) {
+    if (callback == nullptr) {
+        return ScopedAStatus::fromExceptionCode(EX_NULL_POINTER);
+    }
     ScopedAStatus ret = callback->getCurrentUsbFunctionsCb(
             mCurrentUsbFunctions,
             mCurrentUsbFunctionsApplied ? Status::FUNCTIONS_APPLIED : Status::FUNCTIONS_NOT_APPLIED,