diff --git a/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.cpp b/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.cpp
index 7dcc011d1d..b76e0d2726 100755
--- a/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.cpp
+++ b/runtime/Cpp/runtime/src/atn/ArrayPredictionContext.cpp
@@ -22,6 +22,10 @@ namespace {
   }
 
   bool predictionContextEqual(const Ref<const PredictionContext> &lhs, const Ref<const PredictionContext> &rhs) {
+    if (lhs == nullptr)
+      return rhs == nullptr;
+    else if (rhs == nullptr)
+      return false;
     return *lhs == *rhs;
   }