diff --git a/src/add-ons/kernel/bus_managers/usb/Hub.cpp b/src/add-ons/kernel/bus_managers/usb/Hub.cpp
index d7acaa1dba..415a02acca 100644
--- a/src/add-ons/kernel/bus_managers/usb/Hub.cpp
+++ b/src/add-ons/kernel/bus_managers/usb/Hub.cpp
@@ -13,10 +13,15 @@
 
 Hub::Hub(Object *parent, usb_device_descriptor &desc, int8 deviceAddress,
 	usb_speed speed)
-	:	Device(parent, desc, deviceAddress, speed)
+	:	Device(parent, desc, deviceAddress, speed),
+		fInterruptPipe(NULL)
 {
 	TRACE(("USB Hub %d: creating hub\n", DeviceAddress()));
 
+	memset(&fHubDescriptor, 0, sizeof(fHubDescriptor));
+	for (int32 i = 0; i < 8; i++)
+		fChildren[i] = NULL;
+
 	if (!fInitOK) {
 		TRACE_ERROR(("USB Hub %d: device failed to initialize\n", DeviceAddress()));
 		return;
@@ -30,9 +35,6 @@ Hub::Hub(Object *parent, usb_device_descriptor &desc, int8 deviceAddress,
 		return;
 	}
 
-	for (int32 i = 0; i < 8; i++)
-		fChildren[i] = NULL;
-
 	if (fDeviceDescriptor.device_class != 9) {
 		TRACE_ERROR(("USB Hub %d: wrong class! bailing out\n", DeviceAddress()));
 		return;
@@ -58,6 +60,11 @@ Hub::Hub(Object *parent, usb_device_descriptor &desc, int8 deviceAddress,
 	TRACE(("\tdevice_removeable:...0x%02x\n", fHubDescriptor.device_removeable));
 	TRACE(("\tpower_control_mask:..0x%02x\n", fHubDescriptor.power_control_mask));
 
+	if (fHubDescriptor.num_ports > 8) {
+		TRACE(("USB Hub %d: hub supports more ports than we do (%d vs. 8)\n", DeviceAddress(), fHubDescriptor.num_ports));
+		fHubDescriptor.num_ports = 8;
+	}
+
 	Object *object = GetStack()->GetObject(Configuration()->interface->active->endpoint[0].handle);
 	if (!object || (object->Type() & USB_OBJECT_INTERRUPT_PIPE) == 0) {
 		TRACE_ERROR(("USB Hub %d: no interrupt pipe found\n", DeviceAddress()));
@@ -183,12 +190,6 @@ void
 Hub::Explore()
 {
 	for (int32 i = 0; i < fHubDescriptor.num_ports; i++) {
-		if (i >= 8) {
-			TRACE(("USB Hub %d: hub supports more ports than we do (%d)\n", DeviceAddress(), fHubDescriptor.num_ports));
-			fHubDescriptor.num_ports = 8;
-			continue;
-		}
-
 		status_t result = UpdatePortStatus(i);
 		if (result < B_OK)
 			continue;
@@ -228,6 +229,20 @@ Hub::Explore()
 					continue;
 				}
 
+				if (fChildren[i]) {
+					TRACE_ERROR(("USB Hub %d: new device on a port that is already in use\n", DeviceAddress()));
+
+					// Remove previous device first
+					TRACE(("USB Hub %d: removing device 0x%08lx\n", DeviceAddress(), fChildren[i]));
+					GetStack()->NotifyDeviceChange(fChildren[i], false);
+
+					if (Lock()) {
+						GetBusManager()->FreeDevice(fChildren[i]);
+						fChildren[i] = NULL;
+						Unlock();
+					}
+				}
+
 				usb_speed speed = USB_SPEED_FULLSPEED;
 				if (fPortStatus[i].status & PORT_STATUS_LOW_SPEED)
 					speed = USB_SPEED_LOWSPEED;
diff --git a/src/add-ons/kernel/bus_managers/usb/Stack.cpp b/src/add-ons/kernel/bus_managers/usb/Stack.cpp
index 2cd4cdbbbf..3660e6caeb 100644
--- a/src/add-ons/kernel/bus_managers/usb/Stack.cpp
+++ b/src/add-ons/kernel/bus_managers/usb/Stack.cpp
@@ -75,11 +75,6 @@ Stack::Stack()
 	fExploreThread = spawn_kernel_thread(ExploreThread, "usb explore",
 		B_LOW_PRIORITY, this);
 	resume_thread(fExploreThread);
-
-	// wait for the first explore to complete
-	// this ensures that we get all initial devices under InstallNotify
-	while (!fFirstExploreDone)
-		snooze(1000);
 }
 
 
@@ -380,6 +375,11 @@ Stack::InstallNotify(const char *driverName, const usb_notify_hooks *hooks)
 {
 	TRACE(("USB Stack: installing notify hooks for driver \"%s\"\n", driverName));
 
+	// wait for the first explore to complete
+	// this ensures that we get all initial devices
+	while (!fFirstExploreDone)
+		snooze(1000);
+
 	usb_driver_info *element = fDriverList;
 	while (element) {
 		if (strcmp(element->driver_name, driverName) == 0) {