1 files changed, 6 insertions, 0 deletions
diff --git a/js/src/jit/IonBuilder.cpp b/js/src/jit/IonBuilder.cpp
index dae86fd92a..dbecec2a7e 100644
--- a/js/src/jit/IonBuilder.cpp
+++ b/js/src/jit/IonBuilder.cpp
@@ -1649,6 +1649,12 @@ IonBuilder::snoopControlFlow(JSOp op)
             // while (cond) { }
             return whileOrForInLoop(sn);
 
+          case SRC_OPTCHAIN:
+            // XXX Instead of aborting early, breaking at this point works.
+            // However, I'm not sure if we still need to further process
+            // optional chains under IonBuilder.
+            break;
+
           default:
             // Hard assert for now - make an error later.
             MOZ_CRASH("unknown goto case");