Merge remote-tracking branch 'origin/5.5' into dev

Change-Id: I40f55a4eabaf2d0d6bcda0a4b6111b27130f24f3

1 files changed, 4 insertions, 1 deletions

diff --git a/src/xmlpatterns/expr/qunaryexpression.cpp b/src/xmlpatterns/expr/qunaryexpression.cpp
index 1c4524e..f99096b 100644
--- a/src/xmlpatterns/expr/qunaryexpression.cpp
+++ b/src/xmlpatterns/expr/qunaryexpression.cpp
@@ -59,7 +59,10 @@ Item UnaryExpression::evaluateSingleton(const DynamicContext::Ptr &context) cons
     {
         const Item item(m_operand2->evaluateSingleton(context));
 
-        if(item)
+        if (item)
+            // If the item is an untypedAtomic (or atomicString), the cast to Numeric will
+            // return a garbage object and will most likely cause a crash.
+            // There is simply no way to static cast from an instance of AtomicString to a Number.
             return item.as<Numeric>()->toNegated();
         else
             return Item();