diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index 6b48747..47bb3cd 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -1768,6 +1768,10 @@ struct CheckRangeLeftSide {
           return true;
         } else {
           n = nextSibling(n);
+          if (n == nullptr) {
+            ok = true;
+            return true;
+          }
           return downLeftSpine();
         }
       }
@@ -1795,6 +1799,10 @@ struct CheckRangeLeftSide {
             return true;
           } else {
             n = nextSibling(n);
+            if (n == nullptr) {
+              ok = true;
+              return true;
+            }
             return downLeftSpine();
           }
         }
@@ -1831,10 +1839,6 @@ struct CheckRangeLeftSide {
 
   bool downLeftSpine() {
     phase = DownLeftSpine;
-    if (n == nullptr) {
-      ok = true;
-      return true;
-    }
     return false;
   }
 };