1 files changed, 10 insertions, 3 deletions
diff --git a/src/corelib/kernel/qvariant.cpp b/src/corelib/kernel/qvariant.cpp
index 5ffac55cfd..2844f09949 100644
--- a/src/corelib/kernel/qvariant.cpp
+++ b/src/corelib/kernel/qvariant.cpp
@@ -253,11 +253,15 @@ static void customConstruct(QVariant::Private *d, const void *copy)
         *d = QVariant::Private();
         return;
     }
+    if (!iface->copyCtr || (!copy && !iface->defaultCtr)) {
+        // QVariant requires type to be copy and default constructible
+        *d = QVariant::Private();
+        qWarning("QVariant: Provided metatype does not support "
+                 "destruction, copy and default construction");
+        return;
+    }
 
     if (QVariant::Private::canUseInternalSpace(iface)) {
-        // QVariant requires type to be copy and default constructible
-        Q_ASSERT(iface->copyCtr);
-        Q_ASSERT(iface->defaultCtr);
         if (copy)
             iface->copyCtr(iface, &d->data, copy);
         else
@@ -814,6 +818,9 @@ QVariant::QVariant(const QVariant &p)
     instead to construct variants from the pointer types represented by
     \c QMetaType::VoidStar, and \c QMetaType::QObjectStar.
 
+    If \a type does not support copy and default construction, the variant will
+    be invalid.
+
     \sa QVariant::fromValue(), QMetaType::Type
 */
 QVariant::QVariant(QMetaType type, const void *copy) : d(type)