fix(events): Fix crash in getStdFunctionAddress (#10321)

Author: me-no-dev

libraries/Network/src/NetworkEvents.cpp

@@ -228,7 +228,10 @@ void NetworkEvents::removeEvent(NetworkEventCb cbEvent, arduino_event_id_t event
 template<typename T, typename... U> static size_t getStdFunctionAddress(std::function<T(U...)> f) {
   typedef T(fnType)(U...);
   fnType **fnPointer = f.template target<fnType *>();
-  return (size_t)*fnPointer;
+  if (fnPointer != nullptr) {
+    return (size_t)*fnPointer;
+  }
+  return (size_t)fnPointer;
 }
 
 void NetworkEvents::removeEvent(NetworkEventFuncCb cbEvent, arduino_event_id_t event) {