Index: openmp/runtime/src/kmp_runtime.cpp
===================================================================
--- openmp/runtime/src/kmp_runtime.cpp
+++ openmp/runtime/src/kmp_runtime.cpp
@@ -8707,7 +8707,7 @@
   KMP_DEBUG_ASSERT(lck); // it would be nice to test ( lck != 0 )
 
 #define FAST_REDUCTION_ATOMIC_METHOD_GENERATED                                 \
-  ((loc->flags & (KMP_IDENT_ATOMIC_REDUCE)) == (KMP_IDENT_ATOMIC_REDUCE))
+  (loc && ((loc->flags & (KMP_IDENT_ATOMIC_REDUCE)) == (KMP_IDENT_ATOMIC_REDUCE)))
 #define FAST_REDUCTION_TREE_METHOD_GENERATED ((reduce_data) && (reduce_func))
 
   retval = critical_reduce_block;