--- a/js/src/ion/IonFrames.cpp
+++ b/js/src/ion/IonFrames.cpp
@@ -1044,16 +1044,25 @@ GetPcScript(JSContext *cx, JSScript **sc
 {
     IonSpew(IonSpew_Snapshots, "Recover PC & Script from the last frame.");
 
     JSRuntime *rt = cx->runtime();
 
     // Recover the return address.
     IonFrameIterator it(rt->mainThread.ionTop);
 
+    // If the previous frame is a rectifier frame (maybe unwound),
+    // skip past it.
+    if (it.prevType() == IonFrame_Rectifier || it.prevType() == IonFrame_Unwound_Rectifier) {
+        ++it;
+        JS_ASSERT(it.prevType() == IonFrame_BaselineStub ||
+                  it.prevType() == IonFrame_BaselineJS ||
+                  it.prevType() == IonFrame_OptimizedJS);
+    }
+
     // If the previous frame is a stub frame, skip the exit frame so that
     // returnAddress below gets the return address into the BaselineJS
     // frame.
     if (it.prevType() == IonFrame_BaselineStub || it.prevType() == IonFrame_Unwound_BaselineStub) {
         ++it;
         JS_ASSERT(it.prevType() == IonFrame_BaselineJS);
     }