diff --git a/devices/mtpdevice.cpp b/devices/mtpdevice.cpp
index 642e0927d..52901eec2 100644
--- a/devices/mtpdevice.cpp
+++ b/devices/mtpdevice.cpp
@@ -545,7 +545,7 @@ void MtpDevice::deviceDetails(const QString &s)
 
 bool MtpDevice::isConnected() const
 {
-    return pmp && connection->isConnected();
+    return pmp && pmp->isValid() && connection->isConnected();
 }
 
 void MtpDevice::configure(QWidget *parent)
diff --git a/devices/umsdevice.cpp b/devices/umsdevice.cpp
index 6f68457c8..2e53e0db0 100644
--- a/devices/umsdevice.cpp
+++ b/devices/umsdevice.cpp
@@ -65,7 +65,7 @@ UmsDevice::~UmsDevice() {
 
 bool UmsDevice::isConnected() const
 {
-    return access && access->isAccessible();
+    return access && access->isValid() && access->isAccessible();
 }
 
 double UmsDevice::usedCapacity()