diff --git a/js/src/jsexn.cpp b/js/src/jsexn.cpp
index 10edf66b748..7e881859314 100644
--- a/js/src/jsexn.cpp
+++ b/js/src/jsexn.cpp
@@ -296,6 +296,8 @@ InitExnPrivate(JSContext *cx, JSObject *exnObject, JSString *message,
     stackDepth = 0;
     valueCount = 0;
     for (fp = js_GetTopStackFrame(cx); fp; fp = fp->prev()) {
+        if (fp->scopeChain().compartment() != cx->compartment)
+            break;
         if (fp->isFunctionFrame() && !fp->isEvalFrame()) {
             Value v = NullValue();
             if (checkAccess &&
@@ -337,6 +339,8 @@ InitExnPrivate(JSContext *cx, JSObject *exnObject, JSString *message,
     values = GetStackTraceValueBuffer(priv);
     elem = priv->stackElems;
     for (fp = js_GetTopStackFrame(cx); fp != fpstop; fp = fp->prev()) {
+        if (fp->scopeChain().compartment() != cx->compartment)
+            break;
         if (!fp->isFunctionFrame() || fp->isEvalFrame()) {
             elem->funName = NULL;
             elem->argc = 0;